Re^3: check if string is valid with special cases

the substring can conatin commas in it

Sorry, this doesn't make sense to me. If the input string is "1,2,3,4,5,6,7", then does $a get "1,2", or does $b get "2,3", and so on...

Or is this CSV, as swl correctly pointed out? Then you should use Text::CSV.

If not, then as I said, please provide lots of examples of valid input with the expected output, as well as lots of examples of invalid input.

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Re^6: check if string is valid with special cases by ovedpo15 (Pilgrim) on May 15, 2018 at 11:21 UTC
"a ,b,c,d,e" is okay (space with substring) but one space or more (without any symbols) isn't valid. For example: "a, ,c,d,e" or "a,b,c, d,e" are not valid.	[reply]
Re^4: check if string is valid with special cases by ovedpo15 (Pilgrim) on May 15, 2018 at 11:09 UTC
Ok I understand, forget about commas in the substrings. your regex is good and its what I need except it doesn't handle an empty space case: "a,b,c, d,e" (bad case). how can I add it to the regex?	[reply]
Re^5: check if string is valid with special cases by haukex (Archbishop) on May 15, 2018 at 11:17 UTC
Again, more examples please. Only literal spaces? I am guessing you mean one or more spaces? What about other whitespace? Is `" x ,..."` valid? Is `" x y ,..."`? What is the expected output for those cases? And so on.	[reply] [d/l] [select]