Regular Expressions 101

Pro

\ban ASCII word boundary

Group 1(\.video(?!lecture\b)|(?<!\bfb)\.watch)

1st Alternative\.video(?!lecture\b)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

videothe literal text video (case sensitive)

Negative Lookahead(?!lecture\b)

lecturethe literal text lecture (case sensitive)

\ban ASCII word boundary

2nd Alternative(?<!\bfb)\.watch

Negative Lookbehind(?<!\bfb)

\ban ASCII word boundary

fbthe literal text fb (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

watchthe literal text watch (case sensitive)

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

\b(\.video(?!lecture\b)|(?<!\bfb)\.watch)

site.watch or some.video

fb.watch
videolecture

site.watch or some.video

fb.watch
videolecture