Regular Expressions 101

(?s)applies the following effective flags to the remainder of the pattern: gis

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

Positive Lookbehind(?<=<h1\s+class=['""]mb-0\s+mb-lg-1\s+svelte-jcq9ad['""]\s*>)

<h1the literal text <h1 (case insensitive)

\s+a Unicode whitespace character, repeated at least once

class=the literal text class= (case insensitive)

Character Class['""]

'the literal ' (39₁₀ / 47₈ / 27₁₆)

""the literal " (34₁₀ / 42₈ / 22₁₆)

mb-0the literal text mb-0 (case insensitive)

\s+a Unicode whitespace character, repeated at least once

mb-lg-1the literal text mb-lg-1 (case insensitive)

\s+a Unicode whitespace character, repeated at least once

svelte-jcq9adthe literal text svelte-jcq9ad (case insensitive)

Character Class['""]

'the literal ' (39₁₀ / 47₈ / 27₁₆)

""the literal " (34₁₀ / 42₈ / 22₁₆)

\s*a Unicode whitespace character, repeated any number of times

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Group 1(.*?)

.*?any Unicode character, repeated any number of times

Positive Lookahead(?=</\s*h1)

</the literal text </

\s*a Unicode whitespace character, repeated any number of times

h1the literal text h1 (case insensitive)

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?s)(?<=<h1\s+class=['""]mb-0\s+mb-lg-1\s+svelte-jcq9ad['""]\s*>)(.*?)(?=</\s*h1)

New

<div>
     <h1 class="mb-0 mb-lg-1 svelte-jcq9ad">AdBlock — best ad blocker</h1>
     <h2 class="mb-2 svelte-jcq9ad">Block ads and pop-ups on YouTube, Facebook, Twitch, and your favorite websites.</h2>
  </div>
</div>

Regular Expression

Extraction