regex101: URLs

Group href(?<href>(?<origin>(?<protocol>(?<scheme>[a-z][\w\-]{2,}):)?(?:\/\/)?)?(?:(?<username>[^:\s]*):(?<password>[^@\s]*)@)?(?<host>(?<hostname>\B\.{1,2}\B(?=[a-z\d]|\/)|(?:[a-z][a-z-]*)(?:\.[a-z][a-z-\.]*|(?=\/))|(?:[^\s\$]\d[a-z\d-]*)(?:\.[a-z][a-z-\.]*)|(?:(?:25[0-5]|(?:2[0-4]|1\d|[1-9]|)\d)(?:\.(?!$)|$)){4}|localhost)(?:\:(?<port>\d+))?)(?<pathname>\/[^?#\s]*)?(?<search>\?[^#\s]*)?(?<hash>#[^\s]*)?)

Group origin(?<origin>(?<protocol>(?<scheme>[a-z][\w\-]{2,}):)?(?:\/\/)?)?

?repeats the group contents below at most once:

Group protocol(?<protocol>(?<scheme>[a-z][\w\-]{2,}):)?

?repeats the group contents below at most once:

Group scheme(?<scheme>[a-z][\w\-]{2,})

Character Class[a-z]

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

Character Class[\w\-]{2,}

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

\wany word character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

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

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:(?<username>[^:\s]*):(?<password>[^@\s]*)@)?

?repeats the group contents below at most once:

Group username(?<username>[^:\s]*)

Negated Character Class[^:\s]*

*matches any number of characters outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sany whitespace character

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group password(?<password>[^@\s]*)

Negated Character Class[^@\s]*

*matches any number of characters outside the set below:

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\sany whitespace character

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Group host(?<host>(?<hostname>\B\.{1,2}\B(?=[a-z\d]|\/)|(?:[a-z][a-z-]*)(?:\.[a-z][a-z-\.]*|(?=\/))|(?:[^\s\$]\d[a-z\d-]*)(?:\.[a-z][a-z-\.]*)|(?:(?:25[0-5]|(?:2[0-4]|1\d|[1-9]|)\d)(?:\.(?!$)|$)){4}|localhost)(?:\:(?<port>\d+))?)

Group hostname(?<hostname>\B\.{1,2}\B(?=[a-z\d]|\/)|(?:[a-z][a-z-]*)(?:\.[a-z][a-z-\.]*|(?=\/))|(?:[^\s\$]\d[a-z\d-]*)(?:\.[a-z][a-z-\.]*)|(?:(?:25[0-5]|(?:2[0-4]|1\d|[1-9]|)\d)(?:\.(?!$)|$)){4}|localhost)

1st Alternative\B\.{1,2}\B(?=[a-z\d]|\/)

\Bnot an ASCII word boundary

\.{1,2}the literal . (46₁₀ / 56₈ / 2E₁₆) , repeated between 1 and 2 times

\Bnot an ASCII word boundary

Positive Lookahead(?=[a-z\d]|\/)

1st Alternative[a-z\d]

Character Class[a-z\d]

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

\da digit

2nd Alternative\/

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative(?:[a-z][a-z-]*)(?:\.[a-z][a-z-\.]*|(?=\/))

Non-Capturing Group(?:[a-z][a-z-]*)

Character Class[a-z]

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

Character Class[a-z-]*

*matches any number of characters from the set below:

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:\.[a-z][a-z-\.]*|(?=\/))

1st Alternative\.[a-z][a-z-\.]*

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]

Character Class[a-z-\.]*

2nd Alternative(?=\/)

3rd Alternative(?:[^\s\$]\d[a-z\d-]*)(?:\.[a-z][a-z-\.]*)

4th Alternative(?:(?:25[0-5]|(?:2[0-4]|1\d|[1-9]|)\d)(?:\.(?!$)|$)){4}

5th Alternativelocalhost

Non-Capturing Group(?:\:(?<port>\d+))?

Group pathname(?<pathname>\/[^?#\s]*)?

Group search(?<search>\?[^#\s]*)?

Group hash(?<hash>#[^\s]*)?

Global pattern flags

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

Search reference

Regular Expression

(?<href>(?<origin>(?<protocol>(?<scheme>[a-z][\w\-]{2,}):)?(?:\/\/)?)?(?:(?<username>[^:\s]*):(?<password>[^@\s]*)@)?(?<host>(?<hostname>\B\.{1,2}\B(?=[a-z\d]|\/)|(?:[a-z][a-z-]*)(?:\.[a-z][a-z-\.]*|(?=\/))|(?:[^\s\$]\d[a-z\d-]*)(?:\.[a-z][a-z-\.]*)|(?:(?:25[0-5]|(?:2[0-4]|1\d|[1-9]|)\d)(?:\.(?!$)|$)){4}|localhost)(?:\:(?<port>\d+))?)(?<pathname>\/[^?#\s]*)?(?<search>\?[^#\s]*)?(?<hash>#[^\s]*)?)

Regular Expressions 101

Regular Expression

Unit Tests