Rename "RE" functions

[Denneisk]

findRE, matchRE, replaceRE, and explodeRE are simply misleading. This form should be reserved for if actual regex ever gets implemented, and these functions should be superseded by *Pattern alternatives instead.

[Divran]

Maybe yes but I don't think renaming them now is worth it

[vurvdev]

People still do get confused by the names sometimes, I see no harm in using an e2function alias and tagging these as deprecated in favor of functions with new names

https://discord.com/channels/231131817640460288/231356264469233664/1123023231327158272

[vurvdev]

That or adding overloads that take a regex/pattern type