QRegExp Class | Qt 5 Core Compatibility APIs 6.6.3
https://doc.qt.io/qt-6/qregexp.html
WEBA regular expression, or "regexp", is a pattern for matching substrings in a text. This is useful in many contexts, e.g., A brief introduction to regexps is presented, a description of Qt's regexp language, some examples, and the function documentation itself. QRegExp is modeled on Perl's regexp language. It fully supports Unicode.
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