diff --git a/core/fpdfapi/font/cpdf_simplefont.cpp b/core/fpdfapi/font/cpdf_simplefont.cpp
index 8c8520f..56a4b13 100644
--- a/core/fpdfapi/font/cpdf_simplefont.cpp
+++ b/core/fpdfapi/font/cpdf_simplefont.cpp
@@ -130,7 +130,7 @@
   }
   if (m_pFontFile) {
     if (m_BaseFont.GetLength() > 8 && m_BaseFont[7] == '+')
-      m_BaseFont = m_BaseFont.Mid(8, m_BaseFont.GetLength() - 8);
+      m_BaseFont = m_BaseFont.Right(m_BaseFont.GetLength() - 8);
   } else {
     LoadSubstFont();
   }
diff --git a/core/fpdfapi/page/cpdf_streamcontentparser.cpp b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
index 5f571aa..288f9d5 100644
--- a/core/fpdfapi/page/cpdf_streamcontentparser.cpp
+++ b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
@@ -620,7 +620,7 @@
       break;
     }
     auto word = m_pSyntax->GetWord();
-    CFX_ByteString key(word.Mid(1, word.GetLength() - 1));
+    CFX_ByteString key(word.Right(word.GetLength() - 1));
     auto pObj = m_pSyntax->ReadNextObject(false, false, 0);
     if (!key.IsEmpty()) {
       uint32_t dwObjNum = pObj ? pObj->GetObjNum() : 0;
@@ -1186,7 +1186,7 @@
   }
   if (name == "DeviceGray" || name == "DeviceCMYK" || name == "DeviceRGB") {
     CFX_ByteString defname = "Default";
-    defname += name.Mid(7, name.GetLength() - 7);
+    defname += name.Right(name.GetLength() - 7);
     CPDF_Object* pDefObj = FindResourceObj("ColorSpace", defname);
     if (!pDefObj) {
       if (name == "DeviceGray") {
@@ -1525,7 +1525,7 @@
         break;
       case CPDF_StreamParser::Name: {
         auto word = syntax.GetWord();
-        AddNameParam(word.Mid(1, word.GetLength() - 1));
+        AddNameParam(word.Right(word.GetLength() - 1));
         break;
       }
       default:
diff --git a/core/fpdfdoc/cpvt_generateap.cpp b/core/fpdfdoc/cpvt_generateap.cpp
index 83c1f65..956f912 100644
--- a/core/fpdfdoc/cpvt_generateap.cpp
+++ b/core/fpdfdoc/cpvt_generateap.cpp
@@ -66,7 +66,7 @@
     return false;
 
   CPDF_Dictionary* pFontDict =
-      pDRFontDict->GetDictFor(sFontName.Mid(1, sFontName.GetLength() - 1));
+      pDRFontDict->GetDictFor(sFontName.Right(sFontName.GetLength() - 1));
   if (!pFontDict) {
     pFontDict = pDoc->NewIndirect<CPDF_Dictionary>();
     pFontDict->SetNewFor<CPDF_Name>("Type", "Font");
@@ -74,7 +74,7 @@
     pFontDict->SetNewFor<CPDF_Name>("BaseFont", "Helvetica");
     pFontDict->SetNewFor<CPDF_Name>("Encoding", "WinAnsiEncoding");
     pDRFontDict->SetNewFor<CPDF_Reference>(
-        sFontName.Mid(1, sFontName.GetLength() - 1), pDoc,
+        sFontName.Right(sFontName.GetLength() - 1), pDoc,
         pFontDict->GetObjNum());
   }
   CPDF_Font* pDefFont = pDoc->LoadFont(pFontDict);
diff --git a/core/fpdftext/cpdf_linkextract.cpp b/core/fpdftext/cpdf_linkextract.cpp
index 5179f73..e0bd4ae 100644
--- a/core/fpdftext/cpdf_linkextract.cpp
+++ b/core/fpdftext/cpdf_linkextract.cpp
@@ -154,7 +154,7 @@
         while (strBeCheck.GetLength() > 0) {
           wchar_t ch = strBeCheck.GetAt(strBeCheck.GetLength() - 1);
           if (ch == L')' || ch == L',' || ch == L'>' || ch == L'.') {
-            strBeCheck = strBeCheck.Mid(0, strBeCheck.GetLength() - 1);
+            strBeCheck = strBeCheck.Left(strBeCheck.GetLength() - 1);
             nCount--;
           } else {
             break;
diff --git a/core/fpdftext/cpdf_textpage.cpp b/core/fpdftext/cpdf_textpage.cpp
index 1dc03db..8f0e376 100644
--- a/core/fpdftext/cpdf_textpage.cpp
+++ b/core/fpdftext/cpdf_textpage.cpp
@@ -441,8 +441,8 @@
 
   if (nCount == -1) {
     nCount = pdfium::CollectionSize<int>(m_CharList) - start;
-    return CFX_WideString(
-        m_TextBuf.AsStringC().Mid(start, m_TextBuf.AsStringC().GetLength()));
+    CFX_WideStringC wsTextBuf = m_TextBuf.AsStringC();
+    return CFX_WideString(wsTextBuf.Right(wsTextBuf.GetLength() - start));
   }
   if (nCount <= 0 || m_CharList.empty())
     return L"";
diff --git a/core/fpdftext/cpdf_textpagefind.cpp b/core/fpdftext/cpdf_textpagefind.cpp
index 058c293..fe610ab 100644
--- a/core/fpdftext/cpdf_textpagefind.cpp
+++ b/core/fpdftext/cpdf_textpagefind.cpp
@@ -300,7 +300,7 @@
           continue;
         }
         if (pos > 0)
-          m_csFindWhatArray.push_back(csWord.Mid(0, pos));
+          m_csFindWhatArray.push_back(csWord.Left(pos));
         m_csFindWhatArray.push_back(curStr);
         if (pos == csWord.GetLength() - 1) {
           csWord.clear();
diff --git a/core/fxcrt/xml/cxml_parser.cpp b/core/fxcrt/xml/cxml_parser.cpp
index 0166ea8..5ac1f82 100644
--- a/core/fxcrt/xml/cxml_parser.cpp
+++ b/core/fxcrt/xml/cxml_parser.cpp
@@ -86,8 +86,8 @@
   if (iStart == -1) {
     bsName = bsFullName;
   } else {
-    bsSpace = bsFullName.Mid(0, iStart);
-    bsName = bsFullName.Mid(iStart + 1, bsFullName.GetLength() - (iStart + 1));
+    bsSpace = bsFullName.Left(iStart);
+    bsName = bsFullName.Right(bsFullName.GetLength() - (iStart + 1));
   }
 }
 
diff --git a/core/fxge/cfx_fontmapper.cpp b/core/fxge/cfx_fontmapper.cpp
index 5c7b602..4c0073a 100644
--- a/core/fxge/cfx_fontmapper.cpp
+++ b/core/fxge/cfx_fontmapper.cpp
@@ -432,7 +432,7 @@
   CFX_ByteString SubstName = name;
   SubstName.Remove(' ');
   if (bTrueType && name[0] == '@')
-    SubstName = name.Mid(1, name.GetLength() - 1);
+    SubstName = name.Right(name.GetLength() - 1);
   PDF_GetStandardFontName(&SubstName);
   if (SubstName == "Symbol" && !bTrueType) {
     pSubstFont->m_Family = "Chrome Symbol";
@@ -453,7 +453,7 @@
   if (find >= 0) {
     family = SubstName.Left(find);
     PDF_GetStandardFontName(&family);
-    style = SubstName.Mid(find + 1, SubstName.GetLength() - (find + 1));
+    style = SubstName.Right(SubstName.GetLength() - (find + 1));
     bHasComma = true;
   } else {
     family = SubstName;
@@ -480,7 +480,7 @@
     if (!bHasComma) {
       find = family.ReverseFind('-');
       if (find >= 0) {
-        style = family.Mid(find + 1, family.GetLength() - (find + 1));
+        style = family.Right(family.GetLength() - (find + 1));
         family = family.Left(find);
         bHasHyphen = true;
       }
diff --git a/fpdfsdk/formfiller/cba_fontmap.cpp b/fpdfsdk/formfiller/cba_fontmap.cpp
index b195303..577faf4 100644
--- a/fpdfsdk/formfiller/cba_fontmap.cpp
+++ b/fpdfsdk/formfiller/cba_fontmap.cpp
@@ -221,7 +221,7 @@
 
   CFX_ByteString sFontName(syntax.GetWord());
   CFX_ByteString sDecodedFontName = PDF_NameDecode(sFontName);
-  *sAlias = sDecodedFontName.Mid(1, sDecodedFontName.GetLength() - 1);
+  *sAlias = sDecodedFontName.Right(sDecodedFontName.GetLength() - 1);
 
   CPDF_Dictionary* pFontDict = nullptr;
   if (CPDF_Dictionary* pAPDict = m_pAnnotDict->GetDictFor("AP")) {
diff --git a/fpdfsdk/fpdfppo.cpp b/fpdfsdk/fpdfppo.cpp
index d05fab9..bc3d769 100644
--- a/fpdfsdk/fpdfppo.cpp
+++ b/fpdfsdk/fpdfppo.cpp
@@ -91,7 +91,7 @@
     nStringTo = rangstring.Find(',', nStringFrom);
     if (nStringTo == -1)
       nStringTo = nLength;
-    cbMidRange = rangstring.Mid(nStringFrom, nStringTo - nStringFrom);
+    cbMidRange = rangstring.Right(nStringTo - nStringFrom);
     int nMid = cbMidRange.Find('-');
     if (nMid == -1) {
       long lPageNum = atol(cbMidRange.c_str());
@@ -99,7 +99,7 @@
         return false;
       pageArray->push_back((uint16_t)lPageNum);
     } else {
-      int nStartPageNum = atol(cbMidRange.Mid(0, nMid).c_str());
+      int nStartPageNum = atol(cbMidRange.Left(nMid).c_str());
       if (nStartPageNum == 0)
         return false;
 
diff --git a/fpdfsdk/javascript/PublicMethods.cpp b/fpdfsdk/javascript/PublicMethods.cpp
index bf84b9c..06ed64c 100644
--- a/fpdfsdk/javascript/PublicMethods.cpp
+++ b/fpdfsdk/javascript/PublicMethods.cpp
@@ -980,11 +980,10 @@
     }
   }
 
-  CFX_WideString wprefix = wstrValue.Mid(0, pEvent->SelStart());
+  CFX_WideString wprefix = wstrValue.Left(pEvent->SelStart());
   CFX_WideString wpostfix;
   if (pEvent->SelEnd() < wstrValue.GetLength())
-    wpostfix = wstrValue.Mid(pEvent->SelEnd(),
-                             wstrValue.GetLength() - pEvent->SelEnd());
+    wpostfix = wstrValue.Right(wstrValue.GetLength() - pEvent->SelEnd());
   val = wprefix + wstrChange + wpostfix;
   return true;
 }
@@ -1532,14 +1531,13 @@
   CFX_WideString prefix, postfix;
 
   if (pEventHandler->SelStart() >= 0)
-    prefix = swValue.Mid(0, pEventHandler->SelStart());
+    prefix = swValue.Left(pEventHandler->SelStart());
   else
     prefix = L"";
 
   if (pEventHandler->SelEnd() >= 0 &&
       pEventHandler->SelEnd() <= swValue.GetLength())
-    postfix = swValue.Mid(pEventHandler->SelEnd(),
-                          swValue.GetLength() - pEventHandler->SelEnd());
+    postfix = swValue.Right(swValue.GetLength() - pEventHandler->SelEnd());
   else
     postfix = L"";
 
diff --git a/fxbarcode/cbc_ean13.cpp b/fxbarcode/cbc_ean13.cpp
index 1c57a87..ac08a9d 100644
--- a/fxbarcode/cbc_ean13.cpp
+++ b/fxbarcode/cbc_ean13.cpp
@@ -45,7 +45,7 @@
     encodeContents = byteString.UTF8Decode();
   }
   if (length > 13)
-    encodeContents = encodeContents.Mid(0, 13);
+    encodeContents = encodeContents.Left(13);
 
   return encodeContents;
 }
diff --git a/fxbarcode/cbc_ean8.cpp b/fxbarcode/cbc_ean8.cpp
index 3b4369e..ce2cf2b 100644
--- a/fxbarcode/cbc_ean8.cpp
+++ b/fxbarcode/cbc_ean8.cpp
@@ -43,7 +43,7 @@
     encodeContents += wchar_t(checksum - 0 + '0');
   }
   if (length > 8)
-    encodeContents = encodeContents.Mid(0, 8);
+    encodeContents = encodeContents.Left(8);
 
   return encodeContents;
 }
diff --git a/fxbarcode/cbc_upca.cpp b/fxbarcode/cbc_upca.cpp
index 6c2e08a..85b5d54 100644
--- a/fxbarcode/cbc_upca.cpp
+++ b/fxbarcode/cbc_upca.cpp
@@ -44,7 +44,7 @@
     encodeContents = byteString.UTF8Decode();
   }
   if (length > 12)
-    encodeContents = encodeContents.Mid(0, 12);
+    encodeContents = encodeContents.Left(12);
 
   return encodeContents;
 }
diff --git a/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp b/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp
index ec527d2..6034173 100644
--- a/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp
+++ b/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp
@@ -76,13 +76,12 @@
     return CFX_WideString();
 
   context.setAllowRectangular(allowRectangular);
-  if ((msg.Mid(0, 6) == MACRO_05_HEADER) &&
-      (msg.Mid(msg.GetLength() - 1, 1) == MACRO_TRAILER)) {
+  if ((msg.Left(6) == MACRO_05_HEADER) && (msg.Right(1) == MACRO_TRAILER)) {
     context.writeCodeword(MACRO_05);
     context.setSkipAtEnd(2);
     context.m_pos += 6;
-  } else if ((msg.Mid(0, 6) == MACRO_06_HEADER) &&
-             (msg.Mid(msg.GetLength() - 1, 1) == MACRO_TRAILER)) {
+  } else if ((msg.Left(6) == MACRO_06_HEADER) &&
+             (msg.Right(1) == MACRO_TRAILER)) {
     context.writeCodeword(MACRO_06);
     context.setSkipAtEnd(2);
     context.m_pos += 6;
diff --git a/fxbarcode/oned/BC_OnedEAN13Writer.cpp b/fxbarcode/oned/BC_OnedEAN13Writer.cpp
index 0e4bab9..6f1d957 100644
--- a/fxbarcode/oned/BC_OnedEAN13Writer.cpp
+++ b/fxbarcode/oned/BC_OnedEAN13Writer.cpp
@@ -109,7 +109,7 @@
     return nullptr;
 
   m_iDataLenth = 13;
-  int32_t firstDigit = FXSYS_atoi(contents.Mid(0, 1).c_str());
+  int32_t firstDigit = FXSYS_atoi(contents.Left(1).c_str());
   int32_t parities = FIRST_DIGIT_ENCODINGS[firstDigit];
   outLength = m_codeWidth;
   std::unique_ptr<uint8_t, FxFreeDeleter> result(
@@ -219,7 +219,7 @@
                            static_cast<float>(iFontSize), &affine_matrix1,
                            m_fontColor, FXTEXT_CLEARTYPE);
   }
-  tempStr = str.Mid(0, 1);
+  tempStr = str.Left(1);
   iLen = tempStr.GetLength();
   strWidth = multiple * 7;
   strWidth = (int32_t)(strWidth * m_outputHScale);
diff --git a/fxbarcode/oned/BC_OnedEAN8Writer.cpp b/fxbarcode/oned/BC_OnedEAN8Writer.cpp
index f891c08..9a85f81 100644
--- a/fxbarcode/oned/BC_OnedEAN8Writer.cpp
+++ b/fxbarcode/oned/BC_OnedEAN8Writer.cpp
@@ -159,7 +159,7 @@
   CFX_ByteString str = FX_UTF8Encode(contents);
   int32_t iLength = str.GetLength();
   std::vector<FXTEXT_CHARPOS> charpos(iLength);
-  CFX_ByteString tempStr = str.Mid(0, 4);
+  CFX_ByteString tempStr = str.Left(4);
   int32_t iLen = tempStr.GetLength();
   int32_t strWidth = 7 * multiple * 4;
   float blank = 0.0;
diff --git a/fxbarcode/oned/BC_OnedUPCAWriter.cpp b/fxbarcode/oned/BC_OnedUPCAWriter.cpp
index 78ada17..13514eb 100644
--- a/fxbarcode/oned/BC_OnedUPCAWriter.cpp
+++ b/fxbarcode/oned/BC_OnedUPCAWriter.cpp
@@ -183,7 +183,7 @@
                            static_cast<float>(iFontSize), &affine_matrix1,
                            m_fontColor, FXTEXT_CLEARTYPE);
   }
-  tempStr = str.Mid(0, 1);
+  tempStr = str.Left(1);
   iLen = tempStr.GetLength();
   strWidth = (float)multiple * 7;
   strWidth = strWidth * m_outputHScale;
diff --git a/fxbarcode/qrcode/BC_QRCoderEncoder.cpp b/fxbarcode/qrcode/BC_QRCoderEncoder.cpp
index 955e2c7..cad70b8 100644
--- a/fxbarcode/qrcode/BC_QRCoderEncoder.cpp
+++ b/fxbarcode/qrcode/BC_QRCoderEncoder.cpp
@@ -432,7 +432,7 @@
     index += 2;
   }
   if (index)
-    result->push_back({CBC_QRCoderMode::sGBK, content.Mid(0, index)});
+    result->push_back({CBC_QRCoderMode::sGBK, content.Left(index)});
   if (index >= content.GetLength())
     return;
 
@@ -479,7 +479,7 @@
   }
   flag = index;
   if (index < content.GetLength())
-    SplitString(content.Mid(index, content.GetLength() - index), result);
+    SplitString(content.Right(content.GetLength() - index), result);
 }
 
 CBC_QRCoderMode* ChooseMode(const CFX_ByteString& content,
diff --git a/xfa/fgas/crt/cfgas_formatstring.cpp b/xfa/fgas/crt/cfgas_formatstring.cpp
index 0abc86f..f07cce8 100644
--- a/xfa/fgas/crt/cfgas_formatstring.cpp
+++ b/xfa/fgas/crt/cfgas_formatstring.cpp
@@ -2242,7 +2242,7 @@
   }
   if (!bAddNeg && bNeg) {
     *wsOutput = pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Minus) +
-                (*wsOutput)[0] + wsOutput->Mid(1, wsOutput->GetLength() - 1);
+                (*wsOutput)[0] + wsOutput->Right(wsOutput->GetLength() - 1);
   }
   return true;
 }
diff --git a/xfa/fwl/cfwl_edit.cpp b/xfa/fwl/cfwl_edit.cpp
index 1278649..53fec05 100644
--- a/xfa/fwl/cfwl_edit.cpp
+++ b/xfa/fwl/cfwl_edit.cpp
@@ -1152,8 +1152,8 @@
     return false;
 
   int32_t nLen = wsText.GetLength();
-  CFX_WideString l = wsText.Mid(0, caretPos);
-  CFX_WideString r = wsText.Mid(caretPos, nLen - caretPos);
+  CFX_WideString l = wsText.Left(caretPos);
+  CFX_WideString r = wsText.Right(nLen - caretPos);
   CFX_WideString wsNew = l + cNum + r;
   return wsNew.GetInteger() <= m_iMax;
 }
diff --git a/xfa/fxfa/fm2js/cxfa_fm2jscontext.cpp b/xfa/fxfa/fm2js/cxfa_fm2jscontext.cpp
index 1910e60..84064efb 100644
--- a/xfa/fxfa/fm2js/cxfa_fm2jscontext.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fm2jscontext.cpp
@@ -1139,7 +1139,7 @@
   CXFA_LocaleMgr* pMgr = pDoc->GetLocalMgr();
   CFX_ByteString szArgString = ValueToUTF8String(argOne.get());
   FX_STRSIZE pos = szArgString.Find('T', 0);
-  szArgString = szArgString.Mid(pos + 1, szArgString.GetLength() - (pos + 1));
+  szArgString = szArgString.Right(szArgString.GetLength() - (pos + 1));
   if (szArgString.IsEmpty()) {
     args.GetReturnValue()->SetInteger(0);
     return;
@@ -3694,8 +3694,7 @@
 
         CFX_WideString wsTimePattern(L"time{");
         wsTimePattern +=
-            wsPattern.Mid(iTChar + 1, wsPattern.GetLength() - (iTChar + 1)) +
-            L"}";
+            wsPattern.Right(wsPattern.GetLength() - (iTChar + 1)) + L"}";
         wsPattern = wsDatePattern + wsTimePattern;
       } break;
       case XFA_VT_DATE: {
@@ -3881,8 +3880,7 @@
       FX_STRSIZE iTChar = wsPattern.Find(L'T');
       CFX_WideString wsDatePattern(L"date{" + wsPattern.Left(iTChar) + L"} ");
       CFX_WideString wsTimePattern(
-          L"time{" +
-          wsPattern.Mid(iTChar + 1, wsPattern.GetLength() - (iTChar + 1)) +
+          L"time{" + wsPattern.Right(wsPattern.GetLength() - (iTChar + 1)) +
           L"}");
       wsPattern = wsDatePattern + wsTimePattern;
       CXFA_LocaleValue localeValue(patternType, wsValue, wsPattern, pLocale,
diff --git a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
index b201863..a74239f 100644
--- a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
@@ -62,7 +62,7 @@
   javascript << L"function ";
   if (m_wsName.GetAt(0) == L'!') {
     CFX_WideString tempName =
-        EXCLAMATION_IN_IDENTIFIER + m_wsName.Mid(1, m_wsName.GetLength() - 1);
+        EXCLAMATION_IN_IDENTIFIER + m_wsName.Right(m_wsName.GetLength() - 1);
     javascript << tempName;
   } else {
     javascript << m_wsName;
@@ -75,7 +75,7 @@
     if (identifier.GetAt(0) == L'!') {
       CFX_WideString tempIdentifier =
           EXCLAMATION_IN_IDENTIFIER +
-          identifier.Mid(1, identifier.GetLength() - 1);
+          identifier.Right(identifier.GetLength() - 1);
       javascript << tempIdentifier;
     } else {
       javascript << identifier;
@@ -130,7 +130,7 @@
   CFX_WideString tempName(m_wsName);
   if (m_wsName.GetAt(0) == L'!') {
     tempName =
-        EXCLAMATION_IN_IDENTIFIER + m_wsName.Mid(1, m_wsName.GetLength() - 1);
+        EXCLAMATION_IN_IDENTIFIER + m_wsName.Right(m_wsName.GetLength() - 1);
   }
   javascript << tempName;
   javascript << L" = ";
@@ -154,7 +154,7 @@
   CFX_WideString tempName(m_wsName);
   if (m_wsName.GetAt(0) == L'!') {
     tempName =
-        EXCLAMATION_IN_IDENTIFIER + m_wsName.Mid(1, m_wsName.GetLength() - 1);
+        EXCLAMATION_IN_IDENTIFIER + m_wsName.Right(m_wsName.GetLength() - 1);
   }
   javascript << tempName;
   javascript << L" = ";
@@ -461,7 +461,7 @@
   CFX_WideString tempVariant;
   if (m_wsVariant.GetAt(0) == L'!') {
     tempVariant = EXCLAMATION_IN_IDENTIFIER +
-                  m_wsVariant.Mid(1, m_wsVariant.GetLength() - 1);
+                  m_wsVariant.Right(m_wsVariant.GetLength() - 1);
     javascript << tempVariant;
   } else {
     tempVariant = m_wsVariant;
@@ -516,7 +516,7 @@
   CFX_WideString tempVariant;
   if (m_wsVariant.GetAt(0) == L'!') {
     tempVariant = EXCLAMATION_IN_IDENTIFIER +
-                  m_wsVariant.Mid(1, m_wsVariant.GetLength() - 1);
+                  m_wsVariant.Right(m_wsVariant.GetLength() - 1);
     javascript << tempVariant;
   } else {
     tempVariant = m_wsVariant;
@@ -583,7 +583,7 @@
   if (m_wsIdentifier.GetAt(0) == L'!') {
     CFX_WideString tempIdentifier =
         EXCLAMATION_IN_IDENTIFIER +
-        m_wsIdentifier.Mid(1, m_wsIdentifier.GetLength() - 1);
+        m_wsIdentifier.Right(m_wsIdentifier.GetLength() - 1);
     javascript << tempIdentifier;
   } else {
     javascript << m_wsIdentifier;
@@ -615,7 +615,7 @@
   if (m_wsIdentifier.GetAt(0) == L'!') {
     CFX_WideString tempIdentifier =
         EXCLAMATION_IN_IDENTIFIER +
-        m_wsIdentifier.Mid(1, m_wsIdentifier.GetLength() - 1);
+        m_wsIdentifier.Right(m_wsIdentifier.GetLength() - 1);
     javascript << tempIdentifier;
   } else {
     javascript << m_wsIdentifier;
@@ -640,7 +640,7 @@
   if (m_wsIdentifier.GetAt(0) == L'!') {
     CFX_WideString tempIdentifier =
         EXCLAMATION_IN_IDENTIFIER +
-        m_wsIdentifier.Mid(1, m_wsIdentifier.GetLength() - 1);
+        m_wsIdentifier.Right(m_wsIdentifier.GetLength() - 1);
     javascript << tempIdentifier;
   } else {
     javascript << m_wsIdentifier;
@@ -671,7 +671,7 @@
   if (m_wsIdentifier.GetAt(0) == L'!') {
     CFX_WideString tempIdentifier =
         EXCLAMATION_IN_IDENTIFIER +
-        m_wsIdentifier.Mid(1, m_wsIdentifier.GetLength() - 1);
+        m_wsIdentifier.Right(m_wsIdentifier.GetLength() - 1);
     javascript << tempIdentifier;
   } else {
     javascript << m_wsIdentifier;
diff --git a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp
index 1a3a125..32876e3 100644
--- a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp
@@ -181,7 +181,7 @@
     tempStr = L"xfa.template";
   } else if (tempStr[0] == L'!') {
     tempStr =
-        EXCLAMATION_IN_IDENTIFIER + tempStr.Mid(1, tempStr.GetLength() - 1);
+        EXCLAMATION_IN_IDENTIFIER + tempStr.Right(tempStr.GetLength() - 1);
   }
   javascript << tempStr;
   return true;
diff --git a/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp b/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
index e356583..4d6886d 100644
--- a/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
+++ b/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
@@ -162,7 +162,7 @@
     if (wsExpr.GetAt(0) == '#') {
       CXFA_Node* pNode = pDocument->GetNodeByID(
           ToNode(pDocument->GetXFAObject(XFA_HASHCODE_Template)),
-          wsExpr.Mid(1, wsExpr.GetLength() - 1).AsStringC());
+          wsExpr.Right(wsExpr.GetLength() - 1).AsStringC());
       if (pNode)
         return pNode;
     } else if (bNewExprStyle) {
diff --git a/xfa/fxfa/parser/cxfa_measurement.cpp b/xfa/fxfa/parser/cxfa_measurement.cpp
index 5007658..66b715e 100644
--- a/xfa/fxfa/parser/cxfa_measurement.cpp
+++ b/xfa/fxfa/parser/cxfa_measurement.cpp
@@ -40,8 +40,8 @@
   int32_t iOffset = (wsMeasure.GetAt(0) == L'=') ? 1 : 0;
   float fValue = FXSYS_wcstof(wsMeasure.unterminated_c_str() + iOffset,
                               wsMeasure.GetLength() - iOffset, &iUsedLen);
-  XFA_UNIT eUnit = GetUnitFromString(wsMeasure.Mid(
-      iOffset + iUsedLen, wsMeasure.GetLength() - (iOffset + iUsedLen)));
+  XFA_UNIT eUnit = GetUnitFromString(
+      wsMeasure.Right(wsMeasure.GetLength() - (iOffset + iUsedLen)));
   Set(fValue, eUnit);
 }
 
diff --git a/xfa/fxfa/parser/cxfa_node.cpp b/xfa/fxfa/parser/cxfa_node.cpp
index 1265988..261fee1 100644
--- a/xfa/fxfa/parser/cxfa_node.cpp
+++ b/xfa/fxfa/parser/cxfa_node.cpp
@@ -77,7 +77,7 @@
       CFX_WideStringC wsName = pNode->GetCData(XFA_ATTRIBUTE_Name);
       CFX_WideStringC wsInstName = pInstMgrNode->GetCData(XFA_ATTRIBUTE_Name);
       if (wsInstName.GetLength() < 1 || wsInstName.GetAt(0) != '_' ||
-          wsInstName.Mid(1, wsInstName.GetLength() - 1) != wsName) {
+          wsInstName.Right(wsInstName.GetLength() - 1) != wsName) {
         return iCount;
       }
       dwNameHash = pNode->GetNameHash();
@@ -198,7 +198,7 @@
       CFX_WideStringC wsName = pNode->GetCData(XFA_ATTRIBUTE_Name);
       CFX_WideStringC wsInstName = pInstMgrNode->GetCData(XFA_ATTRIBUTE_Name);
       if (wsInstName.GetLength() < 1 || wsInstName.GetAt(0) != '_' ||
-          wsInstName.Mid(1, wsInstName.GetLength() - 1) != wsName) {
+          wsInstName.Right(wsInstName.GetLength() - 1) != wsName) {
         return nullptr;
       }
       dwNameHash = pNode->GetNameHash();
@@ -2737,7 +2737,7 @@
     if (pNode->GetElementType() == XFA_Element::InstanceManager) {
       CFX_WideStringC wsInstMgrName = pNode->GetCData(XFA_ATTRIBUTE_Name);
       if (wsInstMgrName.GetLength() >= 1 && wsInstMgrName.GetAt(0) == '_' &&
-          wsInstMgrName.Mid(1, wsInstMgrName.GetLength() - 1) == wsName) {
+          wsInstMgrName.Right(wsInstMgrName.GetLength() - 1) == wsName) {
         pInstanceMgr = pNode;
       }
       break;
@@ -3165,7 +3165,7 @@
     CFX_WideString wsInstanceName = CFX_WideString(
         wsInstManagerName.IsEmpty()
             ? wsInstManagerName
-            : wsInstManagerName.Mid(1, wsInstManagerName.GetLength() - 1));
+            : wsInstManagerName.Right(wsInstManagerName.GetLength() - 1));
     uint32_t dInstanceNameHash =
         FX_HashCode_GetW(wsInstanceName.AsStringC(), false);
     CXFA_Node* pPrevSibling =
@@ -4665,7 +4665,7 @@
         CFX_WideStringC wsName = GetCData(XFA_ATTRIBUTE_Name);
         CFX_WideStringC wsInstName = pNode->GetCData(XFA_ATTRIBUTE_Name);
         if (wsInstName.GetLength() > 0 && wsInstName.GetAt(0) == '_' &&
-            wsInstName.Mid(1, wsInstName.GetLength() - 1) == wsName) {
+            wsInstName.Right(wsInstName.GetLength() - 1) == wsName) {
           pInstanceMgr = pNode;
         }
         break;
diff --git a/xfa/fxfa/parser/cxfa_widgetdata.cpp b/xfa/fxfa/parser/cxfa_widgetdata.cpp
index 1920e9f..5efc0ea 100644
--- a/xfa/fxfa/parser/cxfa_widgetdata.cpp
+++ b/xfa/fxfa/parser/cxfa_widgetdata.cpp
@@ -1324,8 +1324,7 @@
       int32_t fA, fB;
       fA = FXSYS_wtoi(wsWideNarrowRatio.Left(ptPos).c_str());
       fB = FXSYS_wtoi(
-          wsWideNarrowRatio
-              .Mid(ptPos + 1, wsWideNarrowRatio.GetLength() - (ptPos + 1))
+          wsWideNarrowRatio.Right(wsWideNarrowRatio.GetLength() - (ptPos + 1))
               .c_str());
       if (fB)
         fRatio = (float)fA / fB;