Regular Expressions 101

@ifthe literal text @if (case insensitive)

Non-Capturing Group(?:\s+|)

1st Alternative\s+

\s+any whitespace character, repeated at least once

2nd Alternative — matches an empty string

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 1([\s\S]*?)

Character Class[\s\S]*?

*?matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Group 2([\s\S]*?)+

+repeats the group contents below at least once:

Character Class[\s\S]*?

*?matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

@endifthe literal text @endif (case insensitive)

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

@if(?:\s+|)\(([\s\S]*?)\)([\s\S]*?)+@endif

Test String
New

<div class="wrapper">
  <p>Parágrafo fora dos ifs.</p>

  @if (true)
    <div>Oi?</div>
    @if (false)
    <span>Não devo ser renderizado</span>
    @endif
  @endif

  <p>Estou entre os if's</p>

  @if (true)
    <div>estou em outro if</div>
  @endif
</div>

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
Processing...