Regular Expressions 101

<hthe literal text <h (case sensitive)

Group 1(\d)

\da digit

.*?any character, repeated any number of times

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Group 2(.*)

.*any character, repeated any number of times

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case sensitive)

\1the text saved by group 1

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Group 3(.*)

.*any character, repeated any number of times

Negative Lookahead(?!<h)

<hthe literal text <h (case sensitive)

Global pattern flags

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

s modifier: single line. Allows a dot to match line terminators

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

<h(\d).*?>(.*)<\/h\1>(.*)(?!<h)

New

<h1>AAA</h1><p>aaa aaa aaa</p><div>kkkkk</div><h2>BBB</h2>bbb bbb bbb