Regular Expressions 101

^start of string

Non-Capturing Group(?:http:\/\/)?

?repeats the group contents below at most once:

http:the literal text http: (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

?repeats the group contents below at most once:

wwwthe literal text www (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 1(vk\.com|vkontakte\.ru)

1st Alternativevk\.com

vkthe literal text vk (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case insensitive)

2nd Alternativevkontakte\.ru

vkontaktethe literal text vkontakte (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

ruthe literal text ru (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 2(.*?)?

?repeats the group contents below at most once:

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

wall the literal text wall (case insensitive)

Group 3([-0-9]+_[0-9]+)

Character Class[-0-9]+

+matches at least one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

$end of string, or before its final line terminator

Global pattern flags

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^
(?:http:\/\/)?
(?:www\.)?
(vk\.com|vkontakte\.ru)
\/
(.*?)?
wall
([-0-9]+_[0-9]+)
$