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character means match any single character. The Regular Expression Syntax appendix near the back of the Opus manual and Help file describes the exact syntax which Opus uses. Different programs and programming languages may do things slightly differently and there is no one standard. Just keep in mind that there are, unfortunately, many variations of regular expression syntax. If you want to learn more about regular expressions there are many resources about them on the web.
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Along the way it will also provide you with some frequently requested Rename Presets which you can use whether you understand how they work or not. This guide should help you learn the basics of regular expressions. Regular Expressions make it easy to remove characters from the start or end of filenames. See also: Script to perform multiple Regular Expressions
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