This pattern matches all the Unicode characters that are not allowed in an XML document. It's based on the Wikipedia article "Valid characters in XML".

accept empty spaces at start and end

stackoverflow question

This regex can be used to find all of the packages (.mum) files in the WINDIR%\servicing\Packages directory. I used it to remove the update packages from Winodws 7 pkgmgr /up:"filename" /norestart /quiet

Will return all matches of text between pipe placeholders, e.g. "This text has |two| placeholders |inside| of it" will return matches for two and inside.

Everything, including proto, user:pass, host, query params and anchors

Check version of internet explorer - if is it usable for html5 support etc.

Log Format - combined + cookie at the end. Pattern Desc - combined for all groups.

Format - cookie_combined Pattern - combined for all groups

recognize more than 1000 mails per today with this regex

This regex allow to validate a .so file (with an additional version)

Useful to expand links without a protocol header with a base url src="/bla/blubb" --> src="http:/foo.com/bla/blubb"

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Check if HTTP Header of Cache-Control has all nessery values for highest security

Check if HTTP Header of Public-Key-Pins has all nessery values for highest security