diff --git a/src/providers/delimitedtext/qgsdelimitedtextfile.cpp b/src/providers/delimitedtext/qgsdelimitedtextfile.cpp
index 39a7ddc5eb1a..585de031b0cd 100644
--- a/src/providers/delimitedtext/qgsdelimitedtextfile.cpp
+++ b/src/providers/delimitedtext/qgsdelimitedtextfile.cpp
@@ -717,8 +717,10 @@ QgsDelimitedTextFile::Status QgsDelimitedTextFile::parseRegexp( QString &buffer,
   // and extract capture groups
   if ( mAnchoredRegexp )
   {
-    if ( mDelimRegexp.indexIn( buffer ) < 0 ) return RecordInvalid;
-    QStringList groups = mDelimRegexp.capturedTexts();
+    const QRegularExpressionMatch match = mDelimRegexp.match( buffer );
+    if ( !match.hasMatch() )
+      return RecordInvalid;
+    const QStringList groups = match.capturedTexts();
     for ( int i = 1; i < groups.size(); i++ )
     {
       appendField( fields, groups[i] );
@@ -730,15 +732,19 @@ QgsDelimitedTextFile::Status QgsDelimitedTextFile::parseRegexp( QString &buffer,
   int size = buffer.size();
   while ( true )
   {
-    if ( pos >= size ) break;
-    int matchPos = mDelimRegexp.indexIn( buffer, pos );
+    if ( pos >= size )
+      break;
+    QRegularExpressionMatch match = mDelimRegexp.match( buffer, pos );
+
+    int matchPos = match.capturedStart();
     // If match won't advance cursor, then need to force it along one place
     // to avoid infinite loop.
-    int matchLen = mDelimRegexp.matchedLength();
+    int matchLen = match.capturedLength();
     if ( matchPos == pos && matchLen == 0 )
     {
-      matchPos = mDelimRegexp.indexIn( buffer, pos + 1 );
-      matchLen = mDelimRegexp.matchedLength();
+      match = mDelimRegexp.match( buffer, pos + 1 );
+      matchPos = match.capturedStart();
+      matchLen = match.capturedLength();
     }
     // If no match, then field is to end of record
     if ( matchPos < 0 )
@@ -751,7 +757,7 @@ QgsDelimitedTextFile::Status QgsDelimitedTextFile::parseRegexp( QString &buffer,
     appendField( fields, buffer.mid( pos, matchPos - pos ) );
     if ( mDelimRegexp.captureCount() > 0 )
     {
-      QStringList groups = mDelimRegexp.capturedTexts();
+      QStringList groups = match.capturedTexts();
       for ( int i = 1; i < groups.size(); i++ )
       {
         appendField( fields, groups[i] );
diff --git a/src/providers/delimitedtext/qgsdelimitedtextfile.h b/src/providers/delimitedtext/qgsdelimitedtextfile.h
index 4451d5ef4dfd..d64b36808e2a 100644
--- a/src/providers/delimitedtext/qgsdelimitedtextfile.h
+++ b/src/providers/delimitedtext/qgsdelimitedtextfile.h
@@ -419,7 +419,7 @@ class QgsDelimitedTextFile : public QObject
     int mMaxNameLength = 200;
 
     // Parameters used by parsers
-    QRegExp mDelimRegexp;
+    QRegularExpression mDelimRegexp;
     bool mAnchoredRegexp = false;
     QString mDelimChars;
     QString mQuoteChar;
diff --git a/src/providers/delimitedtext/qgsdelimitedtextprovider.cpp b/src/providers/delimitedtext/qgsdelimitedtextprovider.cpp
index 766f673a5a1e..fdc25f27486c 100644
--- a/src/providers/delimitedtext/qgsdelimitedtextprovider.cpp
+++ b/src/providers/delimitedtext/qgsdelimitedtextprovider.cpp
@@ -222,9 +222,9 @@ QStringList QgsDelimitedTextProvider::readCsvtFieldTypes( const QString &filenam
   // This is a slightly generous regular expression in that it allows spaces and unquoted field types
   // not allowed in OGR CSVT files.  Also doesn't care if int and string fields have
 
-  strTypeList = strTypeList.toLower();
-  QRegExp reTypeList( "^(?:\\s*(\\\"?)(?:integer|real|double|long|longlong|int8|string|date|datetime|time)(?:\\(\\d+(?:\\.\\d+)?\\))?\\1\\s*(?:,|$))+" );
-  if ( ! reTypeList.exactMatch( strTypeList ) )
+  const QRegularExpression reTypeList( QRegularExpression::anchoredPattern( QStringLiteral( "^(?:\\s*(\\\"?)(?:integer|real|double|long|longlong|int8|string|date|datetime|time)(?:\\(\\d+(?:\\.\\d+)?\\))?\\1\\s*(?:,|$))+" ) ) );
+  const QRegularExpressionMatch match = reTypeList.match( strTypeList );
+  if ( !match.hasMatch() )
   {
     // Looks like this was supposed to be a CSVT file, so report bad formatted string
     if ( message ) { *message = tr( "File type string in %1 is not correctly formatted" ).arg( csvtInfo.fileName() ); }
@@ -236,13 +236,15 @@ QStringList QgsDelimitedTextProvider::readCsvtFieldTypes( const QString &filenam
   QgsDebugMsgLevel( QStringLiteral( "Field type string: %1" ).arg( strTypeList ), 2 );
 
   int pos = 0;
-  QRegExp reType( "(integer|real|double|string|date|datetime|time)" );
-
-  while ( ( pos = reType.indexIn( strTypeList, pos ) ) != -1 )
+  const QRegularExpression reType( QStringLiteral( "(integer|real|double|string|date|datetime|time)" ) );
+  QRegularExpressionMatch typeMatch = reType.match( strTypeList, pos );
+  while ( typeMatch.hasMatch() )
   {
-    QgsDebugMsgLevel( QStringLiteral( "Found type: %1" ).arg( reType.cap( 1 ) ), 2 );
-    types << reType.cap( 1 );
-    pos += reType.matchedLength();
+    QgsDebugMsgLevel( QStringLiteral( "Found type: %1" ).arg( typeMatch.captured( 1 ) ), 2 );
+    types << typeMatch.captured( 1 );
+    pos = typeMatch.capturedEnd();
+
+    typeMatch = reType.match( strTypeList, pos );
   }
 
   if ( message )
diff --git a/tests/src/python/test_qgsdelimitedtextprovider_wanted.py b/tests/src/python/test_qgsdelimitedtextprovider_wanted.py
index 71906aba03df..96fa1073a22e 100644
--- a/tests/src/python/test_qgsdelimitedtextprovider_wanted.py
+++ b/tests/src/python/test_qgsdelimitedtextprovider_wanted.py
@@ -893,11 +893,11 @@ def test_018_regular_expression_2():
             'GEXP': 'GEXP',
             'description': 'RE',
             'RE_1': 'RE',
-            'GEXP_1': 'NULL',
-            'data': 'data2',
-            'RE_2': 'RE',
+            'GEXP_1': 'data2',
+            'data': 'RE',
+            'RE_2': 'info2',
             'GEXP_2': 'NULL',
-            'info': 'info2',
+            'info': 'NULL',
             '#fid': 3,
             '#geometry': 'None',
         },