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A regex, or regular expression, is a series of characters that forms a search sample. regex can be used to test if a string incorporates the desired seek sample. utilization: load a logfile, modify mistakes and warning regex and run script to see the way it works be aware: by way of regex to or in how commenting or deleting the entirety, which includes, the tags Unless your regex compiler optimizes alternatives into an o(1) trie shape the way perl’s does, you have to probably be doing a check against hash club rather. different regex engines just aren’t very clever at this. tchrist nov five '11 at 16:26. Ordinary expression, or regex or regexp in short, is extremely and amazingly powerful in searching and manipulating text strings, in particular in processing text documents. one line of regex can effortlessly update several dozen strains of programming codes. regex is supported in all of the scripting languages (which includes perl, python, php, and javascript); as well as pref...