Regular Expressions 101

(?x)applies the following effective flags to the remainder of the pattern: gx

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

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

\w+any word character, repeated at least once

Comment: variable name

Non-Capturing Group(?: (?:( \. ) #method call `.` ( \S+ ) # method name )? ( $ ) # function open paren ( .*?) # function arguments ( $ ) # function close paren )?

?repeats the group contents below at most once:

Non-Capturing Group(?:( \. ) #method call `.` ( \S+ ) # method name )?

?repeats the group contents below at most once:

Group 1( \. )

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Comment: method call `.`

Group 2( \S+ )

\S+any non-whitespace character, repeated at least once

Comment: method name

Group 3( \( )

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Comment: function open paren

Group 4( .*?)

.*?any character (except for line terminators), repeated any number of times

Comment: function arguments

Group 5( \) )

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Comment: function close paren

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?x) \$ \w+ #variable name
(?:
  (?:( \. ) #method call `.`
    ( \S+ ) # method name
  )?
  ( \( )    # function open paren
  ( .*?)    # function arguments
  ( \) )    # function close paren
)?

New

"$created.url ~ "#$origin.human-kind() $origin.name()".subst(:g, /\s+/, '_')