JavaScript RegExp \b meta character

Definition and usage

\b Meta characters match the beginning or end of a word.

Search for the pattern LO at the beginning of the word:

\bLO

Search for the pattern LO at the end of the word:

LO\b

Example

Example 1

Search for "LO" at the beginning of the word:

let text = "HELLO, LOOK AT YOU";
let pattern = /\bLO/;

Try it yourself

Example 2

Search for "LO" at the end of the word:

let text = "HELLO, LOOK AT YOU";
let pattern = /LO\b/;

Try it yourself

Syntax

new RegExp("\\bregexp)

Or abbreviated as:

/\bregexp/

Syntax with modifiers

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

Or abbreviated as:

/\bregexp/g

Browser support

/\b/ It is an ECMAScript1 (ES1) feature.

All browsers fully support ES1 (JavaScript 1997):

Chrome IE Edge Firefox Safari Opera
Supported Supported Supported Supported Supported Supported

Regular expression search methods

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

UsagePattern (pattern)As regular expressions, these are the most commonly used methods:

example description
text.match(pattern) 字符串方法 match()
text.search(pattern) 字符串方法 search()
pattern.exec(text) RexExp 方法 exec()
pattern.test(text) RexExp Method test()