asp.net mvc - FluentValidation centralize a regex validator in validator extension -

i have validation rule common many properties i'd centralize dry, while notempty() rules , work fine, matches(...) , other string-only validator rules don't compile.

no problem:

    public static irulebuilderoptions<t, tproperty> mustnotcontainhtml<t, tproperty>(this irulebuilderoptions<t, tproperty> rulebuilder)            {         return rulebuilder.notempty().withmessage("some message.");     } 

understandably won't compile because uses matches(...) string-only:

    public static irulebuilderoptions<t, tproperty> mustnotcontainhtml<t, tproperty>(this irulebuilderoptions<t, tproperty> rulebuilder)     {         return rulebuilder.matches("<[a-z!/?]|&#").withmessage("'{propertyname}' contains special html characters not allowed.");     } 

what rule builder signature there available string-only options?

the solution reuse actual regularexpressionvalidator:

    public static irulebuilderoptions<t, string> mustnotcontainhtml<t>(this irulebuilder<t, string> rulebuilder)     {         return rulebuilder.setvalidator(new regularexpressionvalidator("<[a-z!/?]|&#")).withmessage("some custom message.");     }