Regular Expressions 101

Pro

Negative Lookbehind(?<!cat\s)

catthe literal text cat (case sensitive)

\sany whitespace character

fthe literal f (102₁₀ / 146₈ / 66₁₆) (case sensitive)

Group 1(ish|rog)

1st Alternativeish

ishthe literal text ish (case sensitive)

2nd Alternativerog

rogthe literal text rog (case sensitive)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

(?<!cat\s)f(ish|rog)

New

"foo catfish fooxcat fish foo cat frogfoo cat fishvfoo cat frog foo dog fish frog fooxfish foo frog"

"foo catfish fooxcat fish foo cat frogfoo cat fishvfoo cat frog foo dog fish frog fooxfish foo frog"