How to Extract Strings Enclosed by Parentheses in JavaScript Using Regular Expressions?

Regular Expression for Extracting Strings Enclosed by Parentheses in JavaScript

Retrieving substrings enclosed by parentheses is a useful operation in many programming scenarios. In JavaScript, regular expressions provide a powerful tool for accomplishing this task. This article explains how to construct a regular expression that effectively captures strings between parentheses.

To extract the characters between parentheses, follow these steps:

1. Escape Parentheses: Since parentheses have special meaning in regular expressions, you need to escape them using the backslash character () to match them literally.
2. Create Capture Group: Use regular parentheses to create a capture group that encapsulates the text between the parentheses.

var regExp = /\(([^)]+)\)/;

In this regular expression, the escaped parentheses (( and )) match the literal opening and closing parentheses, respectively. The capture group (¹ ) matches any non-right parenthesis character (.) one or more times ( ).

Sample Input:

"I expect five hundred dollars (0)."

Example Usage:

var matches = regExp.exec("I expect five hundred dollars (0).");
console.log(matches[1]); // Output: 0

The matches[1] value contains the captured string between the parentheses, which is "$500" in this example.

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