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

Regular Expression to Extract Strings Enclosed in Parentheses in JavaScript

Getting a substring between parentheses in JavaScript using regular expressions can be achieved by constructing a pattern with escaped parentheses (( and )) to match the literal characters and regular parentheses () to create a capturing group. Here's a detailed explanation:

1. Create a set of escaped parentheses: Use the backslash () to escape the parentheses characters, ensuring they match the actual parentheses in the text.
2. Create a capturing group: Within the escaped parentheses, specify the content to be matched using regular parentheses. This group captures the substring you want to retrieve.
3. Construct the regular expression: Combine the escaped parentheses and capturing group into a single regular expression, as shown in the example code provided in the answer:

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

In this pattern, (( and ) match the parentheses characters exactly, while the capturing group (¹ ) matches any character that is not a closing parenthesis.

4. Execute the regular expression: Use the exec() method to apply the regular expression to the input string. The result of the execution is stored in an array, where the first element (matches[0]) represents the entire match, and matches[1] contains the captured substring.
5. Access the captured substring: The desired substring can be accessed by retrieving the contents of matches[1].

This technique allows you to efficiently extract the content within parentheses from JavaScript strings using regular expressions.

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