Sculpting text with regex, grep, sed and awk. Theory: Regular languages Many tools for searching and sculpting text rely on a pattern language known as regular expressions.
The theory of regular languages underpins regular expressions. (Caveat: Some modern "regular" expression systems can describe irregular languages, which is why the term "regex" is preferred for these systems.) Regular languages are a class of formal language equivalent in power to those recognized by deterministic finite automata (DFAs) and nondeterministic finite automata (NFAs). [See my post on converting regular expressions to NFAs.] Online converter - convert video, images, audio and documents for free - StumbleUpon.
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