Regular Expressions 101

Pro

Non-Capturing Group(?: # Non capturing group 1 \G # Matches where the regex engine stops in the previous step (\w+) # capture group 1: a regex word of 1+ chars \h* # zero or more horizontal spaces (space, tabs) (?: # Non capturing group 2 =\h* # literal '=' follower by zero or more hspaces (\w+) # capture group 2: a regex word of 1+ chars )? # make the non capturing group 2 optional )+

+repeats the group contents below at least once:

Comment: Non capturing group 1

\Gstart of current search

Comment: Matches where the regex engine stops in the previous step

Group 1(\w+)

\w+any word character, repeated at least once

Comment: capture group 1: a regex word of 1+ chars

\h*any horizontal whitespace character, repeated any number of times

Comment: zero or more horizontal spaces (space, tabs)

Non-Capturing Group(?: # Non capturing group 2 =\h* # literal '=' follower by zero or more hspaces (\w+) # capture group 2: a regex word of 1+ chars )?

?repeats the group contents below at most once:

Comment: Non capturing group 2

=the literal text =

\h*any horizontal whitespace character, repeated any number of times

Comment: literal '=' follower by zero or more hspaces

Group 2(\w+)

\w+any word character, repeated at least once

Comment: capture group 2: a regex word of 1+ chars

Comment: make the non capturing group 2 optional

Comment: repeat the non capturing group 1, one or more

Global pattern flags

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

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

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25 tokens

Regular Expression

(?:           # Non capturing group 1
  \G          # Matches where the regex engine stops in the previous step
  (\w+)       # capture group 1: a regex word of 1+ chars
  \h*         # zero or more horizontal spaces (space, tabs)
  (?:         # Non capturing group 2
    =\h*      # literal '=' follower by zero or more hspaces
    (\w+)     # capture group 2: a regex word of 1+ chars
  )?          # make the non capturing group 2 optional
)+            # repeat the non capturing group 1, one or more

Unit Tests

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