Regular Expressions 101

1st Alternativehref=("|')(https?:)?\/\/(*SKIP)(*FAIL)

href=the literal text href= (case insensitive)

Group 1("|')

1st Alternative"

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Group 2(https?:)?

?repeats the group contents below at most once:

httpthe literal text http (case insensitive)

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*FAIL)forces the current match attempt to fail at this position

2nd Alternativehref=("|')(.*?)\3

href=the literal text href= (case insensitive)

Group 3("|')

1st Alternative"

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Group 4(.*?)

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

\3the text saved by group 3

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

href=("|')(https?:)?\/\/(*SKIP)(*FAIL)|href=("|')(.*?)\3

New

<a href="//website.com/" />
    <a href="/link1" />
    <a href="https://website.com" />
    <a href="link1" />