Java-春季注入的RegEx-非法字符-＆符

Question

I'm using Spring to inject a RegEx pattern from a properties file but I'm running into an error involving the Ampersand.

Exception in thread "main" java.util.regex.PatternSyntaxException: Illegal
character range near index 34 [ A-Za-z0-9¦#_/<>[]():^¬+=%$£!`@'-&,.";*?\€]

My expression is:

[ A-Za-z0-9\¦#_/<>[\]():^¬+=%$£!`@'\-\u0026,.";*?\\\u20AC]

It works on RegExPal

I've tried escaping the character and using UniCode but I still get the same error.

Does anyone know if there's something in Java / Spring that's causing this to happen?

Answer 1

Double escape the hyphen or keep it at first or last position in your character class:

[- A-Za-z0-9¦#_/<>[\\]():^¬+=%$£!`@'\\u0026,.";*?\\\\\\u20AC]

You can clearly see from the error that it has removed the escaping here:

character range near index 34 [ A-Za-z0-9¦#_/<>[]():^¬+=%$£!`@'-&,.";*?\€]