Regular Expressions 101

<divthe literal text <div (case sensitive)

\ the literal (32₁₀ / 40₈ / 20₁₆)

class="splr-h">the literal text class="splr-h"> (case sensitive)

Negated Character Class[^<]+

+matches at least one character outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

</div>the literal text </div> (case sensitive)

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

Positive Lookahead(?=<div\ class="splr-b">)

<divthe literal text <div (case sensitive)

\ the literal (32₁₀ / 40₈ / 20₁₆)

class="splr-b">the literal text class="splr-b"> (case sensitive)

Group 1( <div[^>]*> (?: [^<]+ | <(?!/?div) | (?1) )++ </div> )

<divthe literal text <div (case sensitive)

Negated Character Class[^>]*

*matches any number of characters outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

> the literal text >

Non-Capturing Group(?: [^<]+ | <(?!/?div) | (?1) )++

++repeats the group contents below at least once:

1st Alternative [^<]+

Negated Character Class[^<]+

+matches at least one character outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

2nd Alternative <(?!/?div)

<the literal text <

Negative Lookahead(?!/?div)

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

divthe literal text div (case sensitive)

3rd Alternative (?1)

(?1)calls group 1 as a subroutine

</div> the literal text </div> (case sensitive)

Global pattern flags

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

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

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Search reference

Regular Expression

<div\ class="splr-h">[^<]+</div>\s*
(?=<div\ class="splr-b">)
(
<div[^>]*>
  (?: [^<]+ | <(?!/?div) | (?1) )++
</div>
)

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