RegExp \ B metacharacter
JavaScript RegExp Object Definition and Usage
\ B metacharacter matches non-word boundary. On a matching location and type the next character is the same: that the word must be, or must be a non-word character. The beginning and end of the string is considered a non-word character.
If no match is found, it returns null.
grammar
new RegExp(" \Bregexp")
或者更简单方式：
/\Bregexp/
或者更简单方式：
/\Bregexp/
Browser Support
All major browsers support \ B metacharacter
Examples
Examples
String is not located in the beginning or end of a word "school" a global search:
var str="Visit W3Cschool";
var patt1=/\Bschool/g;
var patt1=/\Bschool/g;
The marked text below shows where the expression gets a match:
Visit W3C School
try it"
JavaScript RegExp Object