Regular Expressions 101

Positive Lookahead(?=\*([a-zA-Z0-9]+)_START\*\/(.*?)\/\*(\1)_END\*)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

Group 1([a-zA-Z0-9]+)

Character Class[a-zA-Z0-9]+

+matches at least one character from the set below:

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

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

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

_STARTthe literal text _START (case sensitive)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 2(.*?)

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

Group 3(\1)

\1the text saved by group 1

_ENDthe literal text _END (case sensitive)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?=\*([a-zA-Z0-9]+)_START\*\/(.*?)\/\*(\1)_END\*)

New

/*tag1_START*/ some content /*tag1_END*/ other text /*tag2_START*/ some content /*tag2_END*
/*tag3_START*/ some /*tag4_START*/ content /*tag3_END*/ other /*tag4_END*/ content