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Flags:
g global
i ignore case
m multiline
s dotAll
u unicode
Match Details
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Common Patterns Library
Regular Expression Quick Reference
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Regex (regular expressions) are patterns used to match character combinations in strings. The most important metacharacters: . matches any character, * matches zero or more, + matches one or more, ? makes the previous optional, ^ anchors to start, $ anchors to end, \d matches digits, \w matches word characters, \s matches whitespace, and [abc] matches a, b, or c.
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A capture group is a portion of a regex enclosed in parentheses () that captures the matched text for later use. Captured groups are numbered starting at 1. In a replacement string, $1 refers to the first group, $2 to the second, and so on. Non-capturing groups use (?:...) and match without capturing. Named groups use (?<name>...) and can be referenced as $<name> in replacements.