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Asked: 2026-06-02T04:33:38+00:00

I am trying to validate a string in a ‘iterative way’ and all my

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I am trying to validate a string in a ‘iterative way’ and all my tryouts just fail!
I find it a bit complicated and i’m guessing maybe you could teach me how to do it right.
I assume that most of you will suggest me to use regex patterns but i dont really know how, and in general, how can a regex be defined for infinite “sets”?

The string i want to validate is
“ANYTHING|NUMBER_ONLY,ANYTHING|NUMBER_ONLY…”

for example: “hello|5,word|10” and “hello|5,word|10,” are both valid.

note: I dont mind if the string ends with or without a comma ‘,’.

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1 Answer

  1. Editorial Team

    Kleene star (*) lets you define “infinite sets” in regular expressions. Following pattern should do the trick:

    [^,|]+\|\d+(,[^,|]+\|\d+)*,?
A----------B--------------C-

    Part A matches the first element. Part B matches any following elements (notice the star). Part C is the optional comma at the end.

    WARNING: Remember to escape backslashes in Java string.

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