"$ "giving mule expression error in regex

Question

I am trying to match my input field to a regex expression. But it gives mule-expression error,

regex: ^(?:[1-9][0-9]?(?:\.[0-9]{2})?|100(?:\.0{2})?)$

Exception: Unable to resolve reference of $. at 1 : 1"

evaluating expression: Please help me in resolving this issue

Answer 1

Please add "\" before $ and it will work