How to Match Commas Outside Parentheses in Java Using Regex?

Matching Commas Outside Parentheses in Strings

Consider a string resembling the following:

The goal is to construct a regex in Java to select only the commas that are not enclosed within parentheses. In this example, the desired matches would be the commas following "12" and "44."

Solution

The following Java regex accomplishes the task:

Explanation

This regex utilizes a negative lookahead assertion, represented by "(?!...)," to ensure that the next following parenthesis (if any) is not a closing parenthesis. This constraint allows the comma to match only when it is not located within a parenthetical expression.

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