Hi
I'm creating a plugin. The documentation says don't use numbers or other 'specical characters'.
What are 'special characters'? Is the underscore character a special character?
Underscores are fine. Plugin names get put into function names (e.g. for the upgrade function), so stick with the characters that PHP allows in function names.
You are allowed underlines - some of the existing blocks have underline.
I think you should probably assume (whether or not it's true) that underline is the only character permitted apart from [a-z].
Personally I would not recommend using underline because there are already underlines used in other places (e.g. block_ before the plugin name in lang file etc), so having one in the plugin name makes it confusing. However that is just my opinion and not a rule/guideline.
--sam
Indeed. Best-practice for plugin names is just [a-z].