CODEWITHSUNDEEP
javascriptregexregex-group
stackminu
stackminu

Reputation: 781

Regex anything before, with groups

In JS, What I should do to match and put anything before > or ~ into group one in this regex pattern.

Pattern: (?<one>.*)(?:>|~)(?<two>.*) https://regex101.com/r/AOY4k0/1/

Strings:

aaa
bbb>ccc
ddd~eee

In this example, aaa should go into the <one> group.

Upvotes: 0

Views: 122

Answers (2)

The fourth bird
The fourth bird

Reputation: 163287

You could also use a character class and a negated character class starting with [^

^(?<one>[^>~\n]+)(?:[>~](?<two>.*))?$
  • ^ Start of string
  • (?<one>[^>~\n]+) Group one match 1+ times any char other than > ~ or a newline
  • (?: Non capture group
    • [>~] Match either > or ~
    • (?<two>.*) Group two match 0+ times any character except a newline
  • )? Close group and make it optional
  • $ End of string

Regex demo

Upvotes: 1

Ryszard Czech
Ryszard Czech

Reputation: 18611

Use

^(?<one>.*?)(?:(?:>|~)(?<two>.*))?$

Alternative:

^(?<one>.*?)(?:[>~](?<two>.*))?$

See regex proof.

EXPLANATION

--------------------------------------------------------------------------------
  ^                        the beginning of the string
--------------------------------------------------------------------------------
  (?<one>                    group and capture to "one":
--------------------------------------------------------------------------------
    .*?                      any character except \n (0 or more times
                             (matching the least amount possible))
--------------------------------------------------------------------------------
  )                        end of "one"
--------------------------------------------------------------------------------
  (?:                      group, but do not capture (optional
                           (matching the most amount possible)):
--------------------------------------------------------------------------------
    (?:                      group, but do not capture:
--------------------------------------------------------------------------------
      >                        '>'
--------------------------------------------------------------------------------
     |                        OR
--------------------------------------------------------------------------------
      ~                        '~'
--------------------------------------------------------------------------------
    )                        end of grouping
--------------------------------------------------------------------------------
    (?<two>                  group and capture to "two":
--------------------------------------------------------------------------------
      .*                       any character except \n (0 or more
                               times (matching the most amount
                               possible))
--------------------------------------------------------------------------------
    )                        end of "two"
--------------------------------------------------------------------------------
  )?                       end of grouping
--------------------------------------------------------------------------------
  $                        before an optional \n, and the end of the
                           string

Upvotes: 1

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