Regular Expressions 101

^start of line

httpthe literal text http (case sensitive)

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1(www\.)?

?repeats the group contents below at most once:

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

photos18the literal text photos18 (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

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

Group 2((sort\/[\w\d]+)|(v\/[\w\d]+)|(cat\/\d)|)

1st Alternative(sort\/[\w\d]+)

Group 3(sort\/[\w\d]+)

sortthe literal text sort (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[\w\d]+

+matches at least one character from the set below:

\wa Unicode word character

\da Unicode decimal digit

2nd Alternative(v\/[\w\d]+)

Group 4(v\/[\w\d]+)

vthe literal v (118₁₀ / 166₈ / 76₁₆) (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[\w\d]+

+matches at least one character from the set below:

\wa Unicode word character

\da Unicode decimal digit

3rd Alternative(cat\/\d)

Group 5(cat\/\d)

catthe literal text cat (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\da Unicode decimal digit

4th Alternative — matches an empty string

Group 6(\?.*)?

?repeats the group contents below at most once:

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

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

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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Search reference

Regular Expression

^https?:\/\/(www\.)?photos18\.com\/?((sort\/[\w\d]+)|(v\/[\w\d]+)|(cat\/\d)|)(\?.*)?

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