regex101: PCRE (Legacy) Match Workspace

^start of line

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

?repeats the group contents below at most once:

https:the literal text https: (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:(?!-))

Negative Lookahead(?!-)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:xn--)?

?repeats the group contents below at most once:

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

Character Class[a-z0-9]

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

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

Character Class[a-z0-9-_]{0,255}

{0,255}matches between 0 and 255 characters from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[a-z0-9]{0,1}

{0,1}matches at most one character from the set below:

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

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

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z0-9]

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

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

Character Class[a-z0-9-_]{0,61}

{0,61}matches between 0 and 61 characters from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[a-z0-9]{0,1}

{0,1}matches at most one character from the set below:

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

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:xn--)?

?repeats the group contents below at most once:

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

Non-Capturing Group(?:[a-z0-9\-]{1,61}|[a-z0-9-]{1,30}\.[a-z]{2,})

1st Alternative[a-z0-9\-]{1,61}

Character Class[a-z0-9\-]{1,61}

{1,61}matches between 1 and 61 characters from the set below:

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

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

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative[a-z0-9-]{1,30}\.[a-z]{2,}

Character Class[a-z0-9-]{1,30}

{1,30}matches between 1 and 30 characters from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{2,}

{2,}matches at least 2 characters from the set below:

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

$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

Search reference

Regular Expression

^(?:https:\/\/)?(?:(?!-))(?:xn--)?[a-z0-9][a-z0-9-_]{0,255}[a-z0-9]{0,1}\.?[a-z0-9][a-z0-9-_]{0,61}[a-z0-9]{0,1}\.(?:xn--)?(?:[a-z0-9\-]{1,61}|[a-z0-9-]{1,30}\.[a-z]{2,})$

Unit Tests

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