How to Extract Strings within Parentheses using Regular Expressions in JavaScript?

Regular Expression to Extract Strings within Parentheses in JavaScript

Extracting strings enclosed within parentheses from a larger string is a common task in text processing. So, let's explore a solution to this problem using regular expressions in JavaScript.

To capture the string between parentheses, we can use the following regular expression:

/\(([^)]+)\)/

Let's break down this expression:

• (: Matches the left parenthesis.
• [^)] : Matches one or more characters that are not right parentheses. This captures the string within the parentheses.
• ): Matches the right parenthesis.

To use this expression, we can follow these steps:

1. Create a regular expression object using the above pattern.
2. Use the exec() method of the regular expression object to find a match within the input string.
3. The matched string will be stored in the first element of the returned array.

For example, let's consider the string:

I expect five hundred dollars (0).

When we apply our regular expression, the matched string will be:

0

Here's how you can implement this in JavaScript:

var regExp = /\(([^)]+)\)/;
var matches = regExp.exec("I expect five hundred dollars (0).");

// matches[1] contains the value between the parentheses
console.log(matches[1]); // Prints "0"

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