I'm using the following validation string on the code but doesn't work?

validatingString(name: 'Test', description: 'Choose the name of your fileset that you want to create', regex: '^[^,.]$', failedValidationMessage: 'Please use integers without , or .')

After that I run my pipeline and get the following error >>>>
WorkflowScript: 26: Invalid parameter type "validatingString". Valid parameter types: [booleanParam, choice, credentials, file, gitParameter, text, password, run, string, email] @ line 26, column 9.
validatingString(name: 'FILESET', description: 'Choose the name of your fileset that you want to create', regex: '^[^,.]*$', failedValidationMessage: 'Please use integers without , or .')

1 error
Can someone take a look on this one??