Write a regular expression and watch it light up matches live. Load a hacker-flavoured preset to extract IPs from logs, harvest emails, or parse timestamps.
\d digit · \w word char · \s whitespace · . any char · ^ $ start/end* 0+ · + 1+ · ? 0-1 · {2,4} range · [a-z] set · (…) group · (?:…) non-capturing · a|b or