Regex Tester
Build, test and debug regular expressions in real time. Type a pattern, see every match highlight as you type, and inspect capture groups.
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TEST STRING
Enter a pattern to see matches.
. any character\d \w \s digit / word char / whitespace[abc] [^abc] set / negated seta-z range inside a set+ * one-or-more / zero-or-more? optional (zero-or-one){n,m} between n and m times*? +? lazy: as few as possible(...) capture group(?:...) non-capturing group| alternation (or)\1 $1 backreference / replacement\b word boundary^ $ start / end (line with m flag)(?=...) (?<=...) look-ahead / look-behindg i m s flags: global / ignore / multiline / dotallWant to actually understand these? The free course takes you from zero to cracked, one interactive lesson at a time.