xsd-regex should not treat '{' as a normal Char

[alex-lx]

In regexLexer.g4, it says:

Char : ~('.' | '\\' | '?' | '*' | '+' | '(' | ')' | '|' | '[' | ']')

which don't exclude '{', which makes the lexer treat '{' as a normal Char.

e.g.a{1}

[ghost]

https://regex101.com/r/R7NJ4r/1/

FYI

[richardjwilson]

I'm hitting the same problem.

x{0} parses as 4 atoms, but should parse as one atom and a quantifier.

Adding the curly braces to

Char : ~('.' | '\\' | '?' | '*' | '+' | '(' | ')' | '|' | '[' | ']' | '{' | '}')

does appear to fix the problem.