Regular Expressions 101

Non-Capturing Group(?:<iframe[=\w\"]*src=)?

?repeats the group contents below at most once:

<iframethe literal text <iframe (case sensitive)

Character Class[=\w\"]*

*matches any number of characters from the set below:

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\wa Unicode word character

\"the literal " (34₁₀ / 42₈ / 22₁₆)

src=the literal text src= (case sensitive)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

Non-Capturing Group(?:https?://)

httpthe literal text http (case sensitive)

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

://the literal text ://

Non-Capturing Group(?:www\.)?

?repeats the group contents below at most once:

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

youtubethe literal text youtube (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

com/embed/the literal text com/embed/ (case sensitive)

Group 1(\w*)

\w*a Unicode word character, repeated any number of times

\"the literal " (34₁₀ / 42₈ / 22₁₆)

Non-Capturing Group(?:[\w=\";-]*></iframe>)?

?repeats the group contents below at most once:

Character Class[\w=\";-]*

*matches any number of characters from the set below:

\wa Unicode word character

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

></iframe>the literal text ></iframe> (case sensitive)

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?:<iframe[=\w\"]*src=)?\"(?:https?://)(?:www\.)?youtube\.com/embed/(\w*)\"(?:[\w=\";-]*></iframe>)?

New

<ifrmesrc="https://www.youtube.com/embed/xvFZjo5PgG0"></ifrme>
<iframewidth="560"height="315"src="https://www.youtube.com/embed/xvFZjo5PgG0"title="YouTubevideoplayer"frameborder="0"allow="accelerometer;autoplay;clipboard-write;encrypted-media;gyroscope;picture-in-picture"allowfullscreen></iframe>

Regular Expression

Substitution