Regular Expressions 101

Group 1(<iframe.*?src=([\"\'])https?:\/\/w{0,3}.?youtube.com.*?(\2).*?\>)

<iframethe literal text <iframe (case sensitive)

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

src=the literal text src= (case sensitive)

Group 2([\"\'])

Character Class[\"\']

\"the literal " (34₁₀ / 42₈ / 22₁₆)

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

httpthe literal text http (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

w{0,3}the literal w (119₁₀ / 167₈ / 77₁₆) (case sensitive), repeated between 0 and 3 times

.?optionally matches any character (except for line terminators)

youtubethe literal text youtube (case sensitive)

.any character (except for line terminators)

comthe literal text com (case sensitive)

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

Group 3(\2)

\2the text saved by group 2

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

\>the literal > (62₁₀ / 76₈ / 3E₁₆)

Group 4(.*?)

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

Group 5(\<\/iframe\>)

\<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

iframethe literal text iframe (case sensitive)

\>the literal > (62₁₀ / 76₈ / 3E₁₆)

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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Search reference

Regular Expression

(<iframe.*?src=([\"\'])https?:\/\/w{0,3}.?youtube.com.*?(\2).*?\>)(.*?)(\<\/iframe\>)

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