PHP中正则表达式的解析器?

I need to parse regular expressions into their components in PHP. I have no problem creating the regular expressions or executing them, but I want to display information about the regular expression (e.g. list the capture groups, attach repetition characters to their targets, ...). The overall project is a plugin for WordPress that gives info about the rewrite rules, which are regexes with substitution patterns, and can be cryptic to understand.I need to parse regular expressions into their