How Do I Correctly Access Matched Groups from a JavaScript Regular Expression?

How do you access the matched groups in a JavaScript regular expression?

Accessing matched groups in a JavaScript regular expression involves capturing the desired portions of the string using parentheses. Once the regular expression is executed, the captured groups can be accessed from the resulting array.

However, there can be issues when accessing matched groups. For instance, the code below aims to match and capture a parenthesized substring:

<p><div>

The issue here is in the console logging. The console.log() function interprets special characters in the strings it prints. When provided with a string like " format_%A", it attempts to replace %A with the value of the second parameter, resulting in undefined or unexpected behavior. To avoid this, use the json function to print the array explicitly, or simply print the values within the array manually:

console.log(JSON.stringify(arr));
console.log(arr[1]);

Additionally, a more concise and modern approach to iterating over multiple matches in a string is to use the String.prototype.matchAll method, which returns an iterator for each match.

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