Clean Code in JavaScript

RegExp flags

The literal syntax of regular expressions allows for specific flags, such as i (ignore-case), to be specified after the final delimiting forward slash. These flags will affect the way the regular expression is executed:

/hello/.test('hELlO');  // => false/hello/i.test('hELlO'); // => true

When using the RegExp constructor, you can pass your flags as the second argument:

RegExp('hello').test('hELlO');      // => falseRegExp('hello', 'i').test('hELlO'); // => true

There are six available flags in JavaScript's flavor of regular expression:

• i: The ignore-case flag will ignore the case of the string when matching letters (that is, /a/i would match both 'a' andor 'A' in a string).
• g: The global-match flag will make the regular expression ...