Regular Expressions 101

Non-Capturing Group(?:<(?:p|strong|em)\s*(?:[a-z]+=".+")?>){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Non-Capturing Group(?:p|strong|em)

1st Alternativep

pthe literal p (112₁₀ / 160₈ / 70₁₆) (case insensitive)

2nd Alternativestrong

strongthe literal text strong (case insensitive)

3rd Alternativeem

emthe literal text em (case insensitive)

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

Non-Capturing Group(?:[a-z]+=".+")?

?repeats the group contents below at most once:

Character Class[a-z]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

="the literal text ="

.+any character (except for line terminators), repeated at least once

"the literal " (34₁₀ / 42₈ / 22₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

<<<the literal text <<<

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

Character Class[a-z\s-]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

\sany whitespace character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

>>>the literal text >>>

Non-Capturing Group(?:<\/(?:p|strong|em)\s*>){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:p|strong|em)

1st Alternativep

pthe literal p (112₁₀ / 160₈ / 70₁₆) (case insensitive)

2nd Alternativestrong

strongthe literal text strong (case insensitive)

3rd Alternativeem

emthe literal text em (case insensitive)

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

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Global pattern flags

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

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

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Search reference

Regular Expression

(?:<(?:p|strong|em)\s*(?:[a-z]+=".+")?>){1,3}<<<\s*[a-z\s-]+\s*>>>(?:<\/(?:p|strong|em)\s*>){1,3}

Unit Tests

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