regex101: PCRE (Legacy) Match Workspace

^start of line

Group 1((http(s|):\/\/)|)

1st Alternative(http(s|):\/\/)

Group 2(http(s|):\/\/)

httpthe literal text http (case insensitive)

Group 3(s|)

1st Alternatives

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

2nd Alternative — matches an empty string

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative — matches an empty string

Group 4((?=[a-z0-9-]{1,63}\.)(xn--)?[a-z0-9]+(-[a-z0-9]+)*\.)+

+repeats the group contents below at least once:

Positive Lookahead(?=[a-z0-9-]{1,63}\.)

Character Class[a-z0-9-]{1,63}

{1,63}matches between 1 and 63 characters from the set below:

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 5(xn--)?

?repeats the group contents below at most once:

xn--the literal text xn-- (case insensitive)

Character Class[a-z0-9]+

+matches at least one character from the set below:

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 6(-[a-z0-9]+)*

*repeats the group contents below any number of times:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[a-z0-9]+

+matches at least one character from the set below:

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 7(xn--)?

?repeats the group contents below at most once:

xn--the literal text xn-- (case insensitive)

Character Class[a-z0-9-]{1,62}

{1,62}matches between 1 and 62 characters from the set below:

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[a-z]

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

$end of line

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

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

Search reference

Regular Expression

^((http(s|):\/\/)|)((?=[a-z0-9-]{1,63}\.)(xn--)?[a-z0-9]+(-[a-z0-9]+)*\.)+(xn--)?[a-z0-9-]{1,62}[a-z]$

Unit Tests

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