How to check any special characters in Text

[Ken]

@catastrophe2help

check if my specified text does not contains any character which is apart from [ a - z ].

I prefer to use Regex(Regular Expression) for stuff like this:

https://community.thunkable.com/t/regular-expression-extension/3657?u=kenn

Just lowercase - pattern = [^a-z]
lowercase Uppercase and space character - pattern = [^a-zA-Z ]

Thanks @Kevinkun!