This plugin will let you configure which characters are selected when double-clicking on text. It works by taking a file with a list of regular expressions which for now match against characters only.
This project started because I wanted dollar signs included when doubleclicking on PHP variables, for example “$somevar”. EmEditor as it is will select “somevar” but not the dollar sign. With this plugin and the regex [$_a-zA-Z0-9], EmEditor will select the full variable name.
For Em7 and includes source.
Download: http://oooh.eisbaer.be/CustomWordSelect.zip