Regular Expressions 101

<divthe literal text <div (case sensitive)

\ban ASCII word boundary

Non-Capturing Group(?:(?R)|(?:(?!<\/?div).))*

*repeats the group contents below any number of times:

1st Alternative(?R)

(?R)recurses into the entire pattern

2nd Alternative(?:(?!<\/?div).)

Non-Capturing Group(?:(?!<\/?div).)

Negative Lookahead(?!<\/?div)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

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

divthe literal text div (case sensitive)

.any character (except for line terminators)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

div>the literal text div> (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.

Search reference

Regular Expression

<div\b(?:(?R)|(?:(?!<\/?div).))*<\/div>

New

<div class="main">asdasd<div>jk<div>jkjk</div>jk</div></div>