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1.
Short for regular expressions, this is a pattern language used for finding, grepping, or replacing strings. Very powerful if used correctly.
omg omg lol
by unknown October 12, 2003
 
2.
One of the most annoying thing in programming, yet one of the most helpful. Used for parsing text easily.
An example regex to find noobs: ((?:noob).*)
by h@x0r1z3r April 05, 2010