Hello,
For the condition to be met when the parameter value contains only uppercase letters, you need to use the following regular expression: (?-i)^[A-Z]*$
For lower case: (?-i)^[a-z]*$
For the condition to be met when the parameter value starts with a single capital letter followed by lowercase letters, use the following regular expression: (?-i)^[A-Z]{1}[a-z]*$