Regular Expressions 101

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Non-Capturing Group(?:(?<tag>[^\/<>\s]+)(?:\s+(?<attr>[^=>]*)="(?<value>[^"]*)")*|\/?(?<close>(?&tag))\/?)

1st Alternative(?<tag>[^\/<>\s]+)(?:\s+(?<attr>[^=>]*)="(?<value>[^"]*)")*

Group tag(?<tag>[^\/<>\s]+)

Negated Character Class[^\/<>\s]+

+matches at least one character outside the set below:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

\sany whitespace character

Non-Capturing Group(?:\s+(?<attr>[^=>]*)="(?<value>[^"]*)")*

*repeats the group contents below any number of times:

\s+any whitespace character, repeated at least once

Group attr(?<attr>[^=>]*)

Negated Character Class[^=>]*

*matches any number of characters outside the set below:

=the literal = (61₁₀ / 75₈ / 3D₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

="the literal text ="

Group value(?<value>[^"]*)

Negated Character Class[^"]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative\/?(?<close>(?&tag))\/?

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

Group close(?<close>(?&tag))

(?&tag)calls group tag as a subroutine

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

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

<(?:(?<tag>[^\/<>\s]+)(?:\s+(?<attr>[^=>]*)="(?<value>[^"]*)")*|\/?(?<close>(?&tag))\/?)>

Test String
New

<div id="lorem" class="ipsum">Hello World</div><div class="lorem">Ciao mondo<a href="#">clicca qui</a></div><div id="lorem" class="ipsum">Hello World</div><div class="lorem">Ciao mondo<a href="#">clicca qui</a></div>

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
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