regex101: Reddit URL Regex

Pro

^start of line

httpthe literal text http (case sensitive)

Non-Capturing Group(?:s)?

?repeats the group contents below at most once:

sthe 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)

Non-Capturing Group(?:[\w-]+?\.)?

?repeats the group contents below at most once:

Character Class[\w-]+?

+?matches at least one character from the set below:

\wa Unicode word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

redditthe literal text reddit (case sensitive)

.any Unicode character (except for line terminators)

comthe literal text com (case sensitive)

Group 1(/r/|/user/)?

?repeats the group contents below at most once:

1st Alternative/r/

/r/the literal text /r/ (case sensitive)

2nd Alternative/user/

/user/the literal text /user/ (case sensitive)

Condition(?(1)([\w:\.]{2,21}))

Uses the first branch if group 1 matched

If the condition is true, match this branch:([\w:\.]{2,21})

Group 2([\w:\.]{2,21})

Character Class[\w:\.]{2,21}

{2,21}matches between 2 and 21 characters from the set below:

\wa Unicode word character

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3(/comments/)?

?repeats the group contents below at most once:

/comments/the literal text /comments/ (case sensitive)

Condition(?(3)(\w{5,9})(?:/[\w%\\\\-]+)?)?

?repeats the group contents below at most once:

Uses the first branch if group 3 matched

If the condition is true, match this branch:(\w{5,9})(?:/[\w%\\\\-]+)?

Group 4(\w{5,9})

\w{5,9}a Unicode word character, repeated between 5 and 9 times

Non-Capturing Group(?:/[\w%\\\\-]+)?

?repeats the group contents below at most once:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[\w%\\\\-]+

+matches at least one character from the set below:

\wa Unicode word character

%the literal % (37₁₀ / 45₈ / 25₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Condition(?(4)/(\w{3,9}))?

?repeats the group contents below at most once:

Uses the first branch if group 4 matched

If the condition is true, match this branch:/(\w{3,9})

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 5(\w{3,9})

\w{3,9}a Unicode word character, repeated between 3 and 9 times

/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 6(\?)?

?repeats the group contents below at most once:

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Condition(?(6)(\S+))?

?repeats the group contents below at most once:

Uses the first branch if group 6 matched

If the condition is true, match this branch:(\S+)

Group 7(\S+)

\S+any character that is not Unicode whitespace, repeated at least once

Group 8(\#)?

?repeats the group contents below at most once:

\#the literal # (35₁₀ / 43₈ / 23₁₆)

Condition(?(8)(\S+))?

$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

25 tokens

Regular Expression

^http(?:s)?://(?:www\.)?(?:[\w-]+?\.)?reddit.com(/r/|/user/)?(?(1)([\w:\.]{2,21}))(/comments/)?(?(3)(\w{5,9})(?:/[\w%\\\\-]+)?)?(?(4)/(\w{3,9}))?/?(\?)?(?(6)(\S+))?(\#)?(?(8)(\S+))?$

Regular Expressions 101

Regular Expression

Unit Tests