Regular Expressions 101

{IFthe literal text {IF (case insensitive)

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

Group 1([^}]+)

Negated Character Class[^}]+

+matches at least one character outside the set below:

}the literal } (125₁₀ / 175₈ / 7D₁₆)

Group 2([\s\S]+)

Character Class[\s\S]+

+matches at least one character from the set below:

\sany whitespace character

\Sany non-whitespace character

Non-Capturing Group(?:{\/?ELSE})

{the literal { (123₁₀ / 173₈ / 7B₁₆)

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

ELSE}the literal text ELSE} (case insensitive)

Group 3([\s\S]+)

Character Class[\s\S]+

+matches at least one character from the set below:

\sany whitespace character

\Sany non-whitespace character

{the literal { (123₁₀ / 173₈ / 7B₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

IF}the literal text IF} (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

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

{IF\s*([^}]+)}([\s\S]+)(?:{\/?ELSE})([\s\S]+){\/IF}

New

{IF !isLoggedIn}
    <a href="/sign-in/">Sign In</a>
{ELSE}
    Welcome back, {>username}!<br />
    {# students}
    <li>{#>last_name}, {#>first_name}</li>
    {/#}
{/IF}

{IF isLoggedIn}
    Beta Testing...

{/IF}