Question

I’m about to write a parser for a language that’s supposed to have strict syntactic rules about naming of types, variables and such. For example all classes must be PascalCase, and all variables/parameter names and other identifiers must be camelCase.

For example HTMLParser is not allowed and must be named HtmlParser. Any ideas for a regexp that can match something that is PascalCase, but does not have two capital letters in it?

Answer 1

camelCase:

^[a-z]+(?:[A-Z][a-z]+)*$

PascalCase:

^[A-Z][a-z]+(?:[A-Z][a-z]+)*$