Regular Expressions 101

Pro

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Group 1([A-Z][A-Z0-9]*)

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

Character Class[A-Z0-9]*

*matches any number of characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

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

\ban ASCII word boundary

Negated Character Class[^>]*

*matches any number of characters outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Non-Capturing Group(?:(?!\/?\1)[\s\S])*

*repeats the group contents below any number of times:

Negative Lookahead(?!\/?\1)

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

\1the text saved by group 1

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\1the text saved by group 1

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

26 tokens

<([A-Z][A-Z0-9]*)\b[^>]*>(?:(?!\/?\1)[\s\S])*<\/\1>

New

<tag>gimme cookies<tag>gimme more cookies</tag></tag>

<tag>gimme cookies<tag>gimme more cookies</tag></tag>