JS Regex Helper
· 9 min read
A regular expression , also known as regex or regexp , is a sequence of characters that define a search pattern. It can be used to search, edit, or manipulate text and data.
In JavaScript, regular expressions are created using the RegExp object . The RegExp object has a number of methods that can be used to search for and manipulate strings.
Here are some examples of regular expressions in JavaScript:
// Find all occurrences of the letter "a" in a string
const regex = /a/g;
const string = "This is a string.";
const matches = regex.exec(string);
// Replace all occurrences of the letter "a" with the letter "e" in a string
const regex = /a/g;
const string = "This is a string.";
const newString = string.replace(regex, "e");
// Check if a string contains a particular pattern
const regex = /^abc/g;
const string = "abc123";
const match = regex.test(string);