How Do I Handle Backslashes in JavaScript Strings and Regular Expressions?

Getting Backslashes () in Strings

In JavaScript, the backslash character serves both as a special character in string literals and regular expressions. To incorporate an actual backslash, one must double the character () to escape the special meaning.

For example, to define a string with a single backslash:

var str = "\I have one backslash";

Similarly, to define a regular expression pattern matching a single backslash:

var rex = /\/;

When using a string to create a regular expression, the backslashes are doubled at both levels.

// Matches *one* backslash
var rex = new RegExp("\\");

ES2015 and ES2018 Updates

ES2015 introduces template literals, tag functions, and the String.raw function, allowing for the definition of strings with raw backslashes.

let str = String.raw`\apple`;

However, caution is required when using ${ substitutions within template literals, as they may interfere with the raw string interpretation.

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