Regular Expressions – `RegExp` & String Methods

Create a regex:

const emailRE = /^[\w.-]+@[\w.-]+\.\w{2,}$/i;

Common string methods:

• match, replace, search, split.

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Example: Validate & sanitize input

function sanitize(input){
  return input.replace(/[<>"'&]/g, c=>({
    '<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;','&':'&amp;'}[c]));
}

RegExp flags – g (global), i (ignore case), m (multiline), u (unicode), y (sticky).