JavaScript RegExp \xxx meta characters

definition and usage

\xxx Meta characters defined by octal numbers (xxx) matches Latin characters.

instance

Search for octal number 127 (W) globally in the string:

let text = "Visit CodeW3C.com. Hello World!";
let pattern = /\127/g;

try it yourself

syntax

new RegExp("\\xxx)

or abbreviated as:

/\xxx/

Syntax with modifiers

new RegExp("\\xxx", "g")

or abbreviated as:

/\xxx/g

browser support

/\xxx/ is ECMAScript1 (ES1) feature.

All browsers fully support ES1 (JavaScript 1997):

Chrome IE Edge Firefox Safari Opera
support support support support support support

Regular expression search methods

In JavaScript, regular expression text search can be completed with different methods.

usepatternAs regular expressions, these are the most commonly used methods:

example description
text.match(pattern) string method match()
text.search(pattern) string method search()
pattern.exec(text) RexExp method exec()
pattern.test(text) RexExp method test()