Regular Expressions 101

<ref>the literal text <ref> (case sensitive)

Positive Lookahead(?=(?:(?!<\/ref>).)*example\.com)

Non-Capturing Group(?:(?!<\/ref>).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!<\/ref>)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

ref>the literal text ref> (case sensitive)

.any character (except for line terminators)

examplethe literal text example (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

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

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

ref>the literal text ref> (case sensitive)

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.

25 tokens

Regular Expression

<ref>(?=(?:(?!<\/ref>).)*example\.com).*?<\/ref>

New

<ref>{{cite web|title=Foo|url=https://zzz.com/foo}}</ref> blah-blah <ref>{{cite web|title=Bar|url=https://example.com/bar}}</ref> some more blah <ref>{{cite web|title=Foo|url=https://pqr.com/foo}}</ref>

Regular Expression

Substitution