Escaping of characters in like/likeIgnoreCase expressions

[Victor Antonovich]

Hello!

What is correct way of escaping of '%' and '_' characters in query 
like/likeIgnoreCase expressions? Looks like escape chars can be 
specified when Expression instances are created using ExpressionFactory 
methods, but what about expression string representation to use with 
Expression.fromString() method?

Thanks,
Victor.