Regex tester

live regex tester — rust `regex` crate, linear-time nfa, no rebacktracking

regex

pattern:

uses rust's regex crate (perl-like syntax, no look-around / back-references — those require pcre which can blow up exponentially). flags below inject (?flags) at the start of the pattern.

flags:

i — case-insensitive m — multiline ^/$ s — dot matches newline U — swap greedy ↔ lazy x — ignore whitespace in pattern

haystack (text to match against):

live: matches refresh ~250 ms after you stop typing. up to 2048 matches returned per request to keep the response size sane.

[ idle ]

compile error: