Exploring the Sitecore

 This issue can be solved by two ways. 1.Change the Reg Expression  e.g for email filed  Updated Expression is- {"regularExpression":"^(\d{1}-?\(?\d{3}\)?-? *\d{3}-? *-?\d{4}$)|^(\(?\d{3}\)?-? *\d{3}-? *-?\d{4}$)"} 2.Correct solution for this issue is to Create the Language version for the validator you are using.

Sitecore.Serialization.Config   <!--  SERIALIZATION TYPE             Defines serialization type. Possible variants: default and YAML             Default value: default             -->             <setting name="Serialization.SerializationType" value="default" />