c# - Allow underscore "_" as a special character -


this expression, not accepting "_" special character 

{(?=.{8,})(?=(.*\d){0,})(?=(.*\w){1,})}

when set conditions inside pattern, not forget consume characters, add .+ capture 1 or more symbols, or .* capture 0 or more characters:

{(?=.{8,})(?=(.*\d){0,})(?=(.*[^a-za-z0-9]){1,}).+}

however, if want require string have @ least 1 digit , @ least 1 non-word symbol (excluding underscore), i'd suggest using

{(?=.{8,})(?=(?:.*\d){0,})(?=(?:.*[^a-za-z0-9]){1,}).+}

see demo.


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