var fileExtensionPatter = /\.([0-9a-z]+)(?=[?#])|(\.)(?:[\w]+)$/ var ma1 = 'css/global.css?v=1.2'.match(fileExtensionPatter)[0]; console.log(ma1); // return .css ...

Capturing lucene special characters for escaping

https

The way I like it formatted

username is 4-32 characters long no _,- or . at the beginning no _ or _. or . or .. or .- or _- inside no _,- or . at the end ^(?=.{4,32}$)(?![.-])(?!.*[.]{2})[a-zA-Z0-9.-]+(?<![.])$...

Trying to understand the two digit lookup.

Extracts HTML tags, HTML entities, alphanumeric words, and the rest.

Matches phone #s (aaa) bbb-cccc aaa bbb cccc aaabbbcccc and such.