Anything before and after delimiter regex

Question

(?=.+?,*)[^,]+

There are the results I get and expect:

"This,is,successful"

Results:

• This
• is
• successful

",is also successful"

Results:

• is also successful

The following is wrong-

"This is not successful"

Results:

• This is not successful

I only want to match if and only if the delimiter is in the string, anything before and after the delimiter. I tried an additional look ahead with +. . but was either getting results that include everything or nothing at all when a delimiter like ',' was present.

Answer 1

You can use this lookarounds based regex:

(?<=,)[^,]*|[^,]*(?=,)

RegEx Demo

• (?<=,) asserts there is a , before the match
• (?=,) asserts there is a , after the match
• [^,]* matches 0 or more of any character except the comma

Answer 2

Try the following regex:

([^,]+)?,([^,]+)|([^,]+),([^,]+)?

Tested on PHP 5.5. (The above regex works well in PHP with preg_match_all function)