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Positive lookbehind followed by a comma separated list

I am looking to see if there is a way to get the match group for each of the comma separated lists after a positive search.

for example

#summertime swimming, running, tanning

Regex (bye)

(?<=#summertime\s)(.+)

Returns

["swimming, running, tanning"]

Desired results

["swimming", "running", "tanning"]
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2 answers


In php you can do this with PCRE verbs (*SKIP)(*F)

,

(?:^(?:(?!#summertime).)*$|^.*?#summertime)(*SKIP)(*F)|\w+


DEMO

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The classic way to solve this problem in PCRE / perl is to use an \K

escape sequence and \G

anchor :

(?:                 # non-capturing group
   \#summertime\b   # match #summertime
   |                # or
   \G(?<!^),        # a comma not at the beginning of string and match it only if it after the last match
)                   # closing the non-capturing group
\s*                 # some optional whitespaces
\K                  # forget what we matched so far
[^\s,]+             # match anything that not a whitespace nor a comma one or more times

Some notes on regex:



  • I used a modifier x

    for white spacing mode.
  • You may need to use a modifier g

    to match all depending on the language. In php, you will need to use preg_match_all()

    .
  • I have avoided hashtags in #summertime

    because hashtag is for white spaced comments.
  • \G(?<!^)

    - the classic way of matching with the last point, not from the beginning of the line / line. You can also see it in this form \G(?!^)

    or (?!^)\G

    . Remember that they are all zero-width.
  • \K

    awesome .
  • I have used [^\s,]+

    , but you could use \w+

    or whichever suits your needs.
  • A bit late, but you can also use your own solution and then split by \s*,\s*

-

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