Javascript正则表达式以斜杠匹配单词

Question

I'm trying to remove 2 char words and using this regex:

/\b[\w\/]{2}\b/

given a string like: aa bb b/

http://regex101.com/r/dK6qF7/2

Can anyone explain why 'b/' doesn't get matched and removed?

Thanks

Answer 1

/ followed by the end of the string does not form a word boundary, so the last \\b is not satisfied. If your engine can use lookbehinds, you can use:

(?<=[^\w\/]|^)[\w\/]{2}(?=[^\w\/]|$)

Answer 2

A word boundary will match if \\w is followed by \\W (ie [A-Za-Z0-9_] followed by [^A-Za-Z0-9_] ), or vice versa.

Using the regex \\bb/\\b and the input " b/ " , the first word boundary matches, since a space ( \\W ) is followed by b ( \\w ). But the second word boundary won't match: / ( \\W ) is followed by a space ( \\W ).