Regex is not the same as Pattern, better to check input than output

[otradovec]

Regex is not the same as Pattern see: https://www.tutorialspoint.com/javaregex/javaregex_pattern_compile.htm
Better to check input regex from user before storing than after in get method.
I also wonder if it works on Jenkins 2.190, I would appreciate screenshot of place in configuration where i should set it. @runzexia @vjuranek

[runzexia]

Thank you for your contribution.
This plugin works on jenkins 2.190.
I don't understand the difference between pattern and regex, maybe regex will understand better?
However, I think I should keep some methods for compatibility with previous versions of the plugin (maybe users will use groovy to initialize the plugin)

[otradovec]

@runzexia "keep some methods for compatibility" that is a good point, could You specify the methods? I would really appreciate add bit more detail about how to configure the plugin. That would help.