C# Code Sample: var subject = "RE: RE:Fw: RE:FW: FWD: re: This is a message from a long thread re: asdf "; var pattern = @"((?:[\t ](?:R|RE|F|FW|FWD):[\t ]))(.)"; var regex = new Regex(pattern, RegexOptions.ECMAScript | RegexOptions.IgnoreCase); var match = regex.Match(subject); var extr...

https://www.autoitscript.com/forum/topic/105350-truncate-large-string/

File name and extension from url

https://www.regular-expressions.info/numericranges.html

'a-z' - lowercase 'A-Z' - uppercase '-' - hyphens 0-9 - numeric {5, 32} between 5 and 32 characters