check and convert file names for windows compatibility

I need a task to check all file names in my shared data folder and make hem windows compatible. But I already struggle on my first rule: File names are not valid if they start with Space ! I did not find any way to make this rule.

If you want to remove leading spaces, you can use a match pattern to match a file starting with a space. Create a custom attribute to match everything after the space. Look up match patterns in the help for more info on how to use them.

Mr_Noodle wrote:If you want to remove leading spaces, you can use a match pattern to match a file starting with a space. Create a custom attribute to match everything after the space. Look up match patterns in the help for more info on how to use them.

Sorry, I am beginner and I have read the help for match patterns and custom attributes, but a single space is not recognized as a character.

How does it look in the preview?