QRegExp and single-quoted text for QSyntaxHighlighter

Question

What would the QRegExp pattern be for capturing single quoted text for QSyntaxHighlighter? The matches should include the quotes, because I am building a sql code editor.

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Answer 1

I am not an expert in regex but using a C++ answer to detect texts between double quotes changing it to single quote I see that it works:

import sys
from PyQt5 import QtCore, QtGui, QtWidgets

class SyntaxHighlighter(QtGui.QSyntaxHighlighter):
    def __init__(self, parent=None):
        super(SyntaxHighlighter, self).__init__(parent)

        keywordFormat = QtGui.QTextCharFormat()
        keywordFormat.setForeground(QtCore.Qt.darkBlue)
        keywordFormat.setFontWeight(QtGui.QFont.Bold)

        keywordPatterns = ["'([^'']*)'"]

        self.highlightingRules = [(QtCore.QRegExp(pattern), keywordFormat)
                for pattern in keywordPatterns]

    def highlightBlock(self, text):
        for pattern, _format in self.highlightingRules:
            expression = QtCore.QRegExp(pattern)
            index = expression.indexIn(text)
            while index >= 0:
                length = expression.matchedLength()
                self.setFormat(index, length, _format)
                index = expression.indexIn(text, index + length)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    editor = QtWidgets.QTextEdit()
    editor.append("string1 = 'test' and string2 = 'ajsijd'")
    highlighter = SyntaxHighlighter(editor.document())
    editor.show()
    sys.exit(app.exec_())