Regex

How the fuck do they work?

(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t] )+|\Z|(?=[["()<>@,;:\\".[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?: \r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:( ?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\0 31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\ ](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+ (?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?: (?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z |(?=[["()<>@,;:\\".[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n) ?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\ r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n) ?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t] )*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])* )(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t] )+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*) *:(?:(?:\r\n)?[ \t])*)?(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+ |\Z|(?=[["()<>@,;:\\".[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r \n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?: \r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t ]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031 ]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\]( ?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(? :(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(? :\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)|(?:[^()<>@,;:\\".[\] \000-\031]+(?:(? :(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)? [ \t]))*"(?:(?:\r\n)?[ \t])*)*:(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|"(?:[^\"\r\\]| \\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<> @,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|" (?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t] )*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\ ".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(? :[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[ \]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".[\] \000- \031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|"(?:[^\"\r\\]|\\.|( ?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,; :\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([ ^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\" .[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\ ]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\ [\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\ r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\] |\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ \t])*)?(?:[^()<>@,;:\\".[\] \0 00-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|"(?:[^\"\r\\]|\\ .|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@, ;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\]]))|"(? :[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])* (?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\". [\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[ ^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\] ]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)(?:,\s*( ?:(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\ ".[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:( ?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[ ["()<>@,;:\\".[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t ])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t ])+|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(? :\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+| \Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?: [^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\".[\ ]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n) ?[ \t])*(?:@(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[[" ()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n) ?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<> @,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@, ;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t] )*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\ ".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ \t])*)? (?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\\". [\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?: \r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[[ "()<>@,;:\\".[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t]) *))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]) +|\Z|(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\ .(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z |(?=[["()<>@,;:\\".[\]]))|[([^[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:( ?:\r\n)?[ \t])*))*)?;\s*)

Oh look, it's this fucking thread again.
Yes, we've all seen the e-mail regex before. Go show it to /pr/, if you still think it's interesting.

What does this do?

I wrote that regex. It is property of my company. Please cease using it, or you will face legal action.

sigh

>>4
But Bill, we just want to share the software.

>>4
We want to be free hackers, we'll be free.

BNF is superior

>>8
girlslaughing.jpg

He doesn't use the coreutils

>>9
Back to /g/, please.

>>10
You forgot your overline.

>>10
THIS IS MY MEME!!!!!!!!!!!!!!!!!!!!!!!!!