regex101: github user/repo regex

Pro

^start of line

\#the literal # (35₁₀ / 43₈ / 23₁₆)

\s*a Unicode whitespace character, repeated any number of times

Comment: must start with "#" to indicate beeing a repo.

Non-Capturing Group(?:@?@?(?!-)(?P<user>(?:[a-zA-Z0-9]|-(?!-))+[a-zA-Z0-9])(?![^\x00-\x7F]))?

?repeats the group contents below at most once:

@?optionally matches the literal @ (64₁₀ / 100₈ / 40₁₆)

Negative Lookahead(?!-)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group user(?P<user>(?:[a-zA-Z0-9]|-(?!-))+[a-zA-Z0-9])

Non-Capturing Group(?:[a-zA-Z0-9]|-(?!-))+

+repeats the group contents below at least once:

1st Alternative[a-zA-Z0-9]

Character Class[a-zA-Z0-9]

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

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

2nd Alternative-(?!-)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookahead(?!-)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[a-zA-Z0-9]

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

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

Negative Lookahead(?![^\x00-\x7F])

Negated Character Class[^\x00-\x7F]

\x00-\x7Fone character from (0₁₀) to (127₁₀)

Comment: Username part

Non-Capturing Group(?:(?<=\#)|[/\s\.](?<!\v))

1st Alternative(?<=\#)

Positive Lookbehind(?<=\#)

\#the literal # (35₁₀ / 43₈ / 23₁₆)

2nd Alternative[/\s\.](?<!\v)

Character Class[/\s\.]

/the literal / (47₁₀ / 57₈ / 2F₁₆)

\sa Unicode whitespace character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negative Lookbehind(?<!\v)

\va vertical tab character (ASCII 11)

Group repo(?P<repo>[a-zA-Z0-9_.-]+)

Character Class[a-zA-Z0-9_.-]+

+matches at least one character from the set below:

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

25 tokens

Regular Expression

^\#\s* # must start with "#" to indicate beeing a repo.
(?:@?@?(?!-)(?P<user>(?:[a-zA-Z0-9]|-(?!-))+[a-zA-Z0-9])(?![^\x00-\x7F]))?  # Username part
(?:(?<=\#)|[/\s\.](?<!\v))(?P<repo>[a-zA-Z0-9_.-]+)$

#@luckydonald/bonbot
#@luckydonald.bonbot
#@luckydonald bonbot
#luckydonald/bonbot
#luckydonald bonbot
#luckydonald.bonbot
#luckydonald/.home
#luckydonald..home
#luckydonald .home
#/bonbot
#bonbot
#.bonbot
#bonbot


## Not allowed: ##

@luckydonald .home
luckydonald/home
##lol/bar
#@lilz
#@lol@huu
#lol wut lol
#-invalid/ho
#@-invalid/yo
#lolol-/möp
#möü/sdds