One of my favorite tools generates these for regexes, taking much of they mystery out of the syntax:<p><a href="http:&#x2F;&#x2F;regexper.com&#x2F;#(%3F%3ARailroad%7CRegex)%5Cs%2BDiagrams!%3F" rel="nofollow">http:&#x2F;&#x2F;regexper.com&#x2F;#(%3F%3ARailroad%7CRegex)%5Cs%2BDiagrams...</a>