Regular Expressions 101

Group 1(<h1>(.+?)<\/h1>)

<h1>the literal text <h1> (case sensitive)

Group 2(.+?)

.+?any character (except for line terminators), repeated at least once

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

h1>the literal text h1> (case sensitive)

<img class="the literal text <img class=" (case sensitive)

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

" alt="the literal text " alt=" (case sensitive)

Negated Character Class[^"]+

+matches at least one character outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

" the literal text "

Group 3(src="[^"]+")

src="the literal text src=" (case sensitive)

Negated Character Class[^"]+

+matches at least one character outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

(<h1>(.+?)<\/h1>)<img class=".*?" alt="[^"]+" (src="[^"]+")>

<h1>Bla-bla-bla</h1><img class="class" alt="image" src="img.jpg">

\1<img \3 alt="\2">