How to code grammar or lexer rule to describe JSP/EL identifier or string literal in ANTLR? Remember, that JSP/EL is Unicode and you cannot list all possible symbols in a rule. Also remember, that strings can contain EL expressions, which may be complex, so lexer is insufficient to describe them, parser is required, while ANTLR parser is unable to match character classes or any character.
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Checkout the new "Lexical Modes":
Lexical Modes
Modes allow you to group lexical rules by context, such as inside and outside of XML tags. It’s like having multiple sublexers, one for context. The lexer can only return tokens matched by entering a rule in the current mode. Lexers start out in the so-called default mode. All rules are considered to be within the default mode unless you specify a mode command. Modes are not allowed within combined grammars, just lexer grammars.
