Regular Expressions 101

iframethe literal text iframe (case sensitive)

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

Non-Capturing Group(?:\s|width="(.*?)"|height="(.*?)")+

+repeats the group contents below at least once:

1st Alternative\s

\sany whitespace character

2nd Alternativewidth="(.*?)"

width="the literal text width=" (case sensitive)

Group 1(.*?)

.*?any character (except for line terminators), repeated any number of times

"the literal " (34₁₀ / 42₈ / 22₁₆)

3rd Alternativeheight="(.*?)"

height="the literal text height=" (case sensitive)

Group 2(.*?)

.*?any character (except for line terminators), repeated any number of times

"the literal " (34₁₀ / 42₈ / 22₁₆)

src="the literal text src=" (case sensitive)

Group 3(.*?www\.stackoverflow\.com\/share(?:\/.*?)?)

.*?any character (except for line terminators), repeated any number of times

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

stackoverflowthe literal text stackoverflow (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

sharethe literal text share (case sensitive)

Non-Capturing Group(?:\/.*?)?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.*?any character (except for line terminators), repeated any number of times

"the literal " (34₁₀ / 42₈ / 22₁₆)

Global pattern flags

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

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Search reference

Regular Expression

iframe\s*(?:\s|width="(.*?)"|height="(.*?)")+src="(.*?www\.stackoverflow\.com\/share(?:\/.*?)?)"

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