Regular Expressions 101

Pro

(?i)applies the following effective flags to the remainder of the pattern: gmi

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

^start of line

httpthe literal text http (case insensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:w{3}\.)?

?repeats the group contents below at most once:

w{3}the literal w (119₁₀ / 167₈ / 77₁₆) (case insensitive), repeated exactly 3 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

examplethe literal text example (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case insensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

barthe literal text bar (case insensitive)

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1([^\/]*)

Negated Character Class[^\/]*

*matches any number of characters outside the set below:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

$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

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25 tokens

(?i)^https?:\/\/(?:w{3}\.)?example\.com\/bar[12]\/([^\/]*)\/?$

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