Regular Expressions 101

Pro

^start of line

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case insensitive)

Non-Capturing Group(?:\/(\d+)\/[a-z_-]+\/?|op(\d+)\.html)

1st Alternative\/(\d+)\/[a-z_-]+\/?

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1(\d+)

\d+a digit, repeated at least once

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[a-z_-]+

+matches at least one character from the set below:

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternativeop(\d+)\.html

opthe literal text op (case insensitive)

Group 2(\d+)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

htmlthe literal text html (case insensitive)

$end of line

Global pattern flags

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

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

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

Regular Expression

^\/t(?:\/(\d+)\/[a-z_-]+\/?|op(\d+)\.html)$

New

good examples:
/t/2/title/
/t/98127/welcome_world-here/
/top1.html
/top2126.html
/top102542/120939.html

bad examples: #should not match
/top2120/welcome/
/t/2121.html
/t/2124/bla.html
/blabla21051.html

Extraction

good examples:
/t/2/title/
/t/98127/welcome_world-here/
/top1.html
/top2126.html
/top102542/120939.html

bad examples: #should not match
/top2120/welcome/
/t/2121.html
/t/2124/bla.html
/blabla21051.html