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↑ JavaScript | 🔒 Regular Expressions

JavaScript - Regular Expressions

in JavaScript 🔒 Regex are created using //

let string = 'This is a long string.'
let string2 = 'short string'
let regex = /This/
regex.test(string) // true
regex.test(string) // false

regex = /this/i // case insensitive
regex = /^this/ // "this" at the beggining of the string
regex = /this$/ // "this" at the end of the string
regex = /this./ // "this" + any character
regex = /this\./ // escaped so it will actually check for "this."
javascript

Regex bug

Calling regex.test() multiple times is bugged, especially when using a regex in a loop. To fix it set regex.lastIndex = 0 before each test.

See: es3-regexes-broken, tdlr: regex using /g doesn't have their regex.lastIndex reset.