8beefd73_api_Help___Regular_Expressions__Description
[Assertion] \b [Description] 
Specifies that the match must occur on a boundary between \w (alphanumeric) and \W (non-alphanumeric) characters. The match must occur on word boundaries, that is, at the first or last characters in words separated by any non-alphanumeric characters.
Okapi Help - Regular Expressions
Description