ometa SAParser {
  expr :inside = '(' expr(true)* ')'
               | '[' expr(true)* ']'
               | '{' expr(true)* '}'
               | '"' (~'"' ('*' char | '\\' char | char))* '"'
               | ?inside ~(')' | ']' | '}' | '"') char
               | letter letterOrDigit*
               | digit+
               | '.',
  semAction    = <expr(false)+>
}

SAParser.matchAll("[({1+(2)})]", "semAction")
SAParser.matchAll("abc xyz", "semAction")
SAParser.matchAll("%1.2%", "semAction")
SAParser.matchAll("{ out(\"hello })\"); resultis 5 }", "semAction")
SAParser.matchAll('"this is a test\\n"', "semAction")
SAParser.matchAll("x+y", "semAction")
SAParser.matchAll("(x+y)", "semAction")
SAParser.matchAll("foo.bar", "semAction")
SAParser.matchAll("this.m(1, 2, 3+4)", "semAction")