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Test string
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Replace with
($1, $2 … for capture groups)
Result after replace
Quick Reference
Character classes
. Any character\d Digit [0-9]\w Word [a-zA-Z0-9_]\s Whitespace[abc] Character set[^abc] Negated set[a-z] RangeQuantifiers
* 0 or more+ 1 or more? 0 or 1{n} Exactly n{n,m} Between n and m*? Lazy (non-greedy)Anchors & groups
^ Start of string/line$ End of string/line\b Word boundary(abc) Capture group(?:abc) Non-capture groupa|b AlternationCommon patterns
\d{4}-\d{2}-\d{2} Date[\w.+-]+@[\w-]+\.\w+ Emailhttps?://\S+ URL\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b IP#[0-9a-fA-F]{6} Hex color