Regular Expressions 101

^start of line

httpthe literal text http (case sensitive)

Non-Capturing Group(?:s)?

?repeats the group contents below at most once:

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

://the literal text ://

Non-Capturing Group(?:www\.)?

?repeats the group contents below at most once:

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

facebookthe literal text facebook (case sensitive)

.any character (except for line terminators)

Non-Capturing Group(?:[a-z]+)

Character Class[a-z]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negative Lookahead(?!(?:video\.php\?v=\d+|usernameFB/videos/\d+))

Non-Capturing Group(?:video\.php\?v=\d+|usernameFB/videos/\d+)

1st Alternativevideo\.php\?v=\d+

videothe literal text video (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

phpthe literal text php (case sensitive)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

v=the literal text v= (case sensitive)

\d+a digit, repeated at least once

2nd AlternativeusernameFB/videos/\d+

usernameFB/videos/the literal text usernameFB/videos/ (case sensitive)

\d+a digit, repeated at least once

.*any character (except for line terminators), repeated any number of times

$end of line

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.

Search reference

Regular Expression

^http(?:s)?://(?:www\.)?facebook.(?:[a-z]+)/(?!(?:video\.php\?v=\d+|usernameFB/videos/\d+)).*$

New

https://www.facebook.com/video.php?v=100000000000000
https://www.facebook.com/username1/videos/100000000000000
https://www.facebook.com/username2/videos/100000000000000