RegEx Cheater

regular expressions cheat sheet

by trentHarlem

HTML

<!--
Anchors

Qualifiers



-->

JavaScript

// identifies all white space
let spaces = /\s+/g

// identifies white space at beginning and end
let bookendSpaces = /^\s+|\s+$/g

// identifies all letter/number characters
let letters = /\w+/g

// all vowels regardless of case
let vowels = /[a,e,i,o,u]/gi

// identifies all letter/number characters
//let notLetter = /\W+/g
let notLetter = /[^\w+]/g

//Negation. Anything that doesn't contain 'foo'
let negate = /^(?!.*foo).+$/

// identifies all beginnings and endings)
let wordBoundry = /\b/g

// all white space and non-letter characters
let nonLetters = /\W/g

// find quotes
//let highlighter = /('|").+?\1/g
let highlighter = /('|"|(\'|\")).+?\1/g
//let highlighter = /('|")(\\?.).*?\1/g

// all letter groups (words) with 4 or more char in a row
let longerThan = /\w{4,}/g

// 6+ letter password with at least:
// one number, one letter and one symbol
let password = /^(?=.*\d)(?=.*[a-z])(?=[\W_]).{6,}$/i

let lookBehind = /(?<= )/g

let hex = /(#[0-9a-f]+)/gi

let numbers = /^[-+.$]?\d*\.?\d*/g

let dates = /^\d{4}-(0\d|1[0-2])-([0-2]\d|3[01])$/g;

let first = /^We/g;

let letter

let firstLetter = /^${letter}/g


//--------------- FUNCTIONS

let sentence = 'The brown fox jumped over lazy foo river-dogs.'
let sentenceSpace = 'The  brown  fox           jumped   over  foo   lazy river-dogs. \"He said \'Boo!\'\" "He said Boo!"'
let doubleSpace = 'The  brown  fox  jumped   over  foo   lazy  river.'
let we = 'We the people...'
let hexCodes = '#000 red #131313 black #a0f5c9 green #fff #F0F'
let numberList = '-1, .05, +1003, 3.1415926535, 42., $22, $1.00'
let numberArray = [-1, .05, +1003, 3.1415926535, 42., 'sentence']

function wordCount(string) {
// groups of letters (words) that match the regex will by default be separated by characters that do NOT match (.,- etc)
return string.match(letters).length
//return string.match(wordBoundry).length/2
//return string.match(nonLetters).length
}

/* function startsWith(string,letter) {
// first word that starts...