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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.
I have posted a new version of this. Regexs will now do a full match instead of just checking character type.
Here are some more regexs for working with HTML.
; HTML entities (must come before #color regex or  may not select properly)
/&[#da-zA-Z]+;/; HTML #color
/#[da-fA-F]+/; CSS length value
/[-+]?d+(.d+)?(em|ex|pt|px|in|cm|mm|pc)b/; html tags
|)?|
||Updated with the ability to “drag and select” after double-click selecting. It will simply select characters up to the mouse cursor, instead of selecting to the next word boundary.
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