RegEx Tester: Frequently Asked Questions
FAQ
A Regular Expression (RegEx) is a sequence of characters that defines a search pattern. It's commonly used for pattern matching with strings, or string matching, as well as find-and-replace operations.
Enter your regular expression pattern, select the appropriate flags (like global, case-insensitive, etc.), and provide a test string. The tester will show you all matches found and allow you to test replacement operations.
g (global): Match all occurrences
i (case-insensitive): Case doesn't matter
m (multiline): ^ and $ match start/end of each line
s (dotAll): Dot matches newlines
u (unicode): Enable unicode support
y (sticky): Match only from lastIndex