Freebase (0.00 / 0 votes) Rate this definition: Meta. Meta, is a prefix used in English to indicate a concept which is an abstraction from another concept, used to complete or add to the latter. The New Hacker's Dictionary (0.00 / 0 votes) Rate this definition:
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The IEEE POSIX standard has three sets of compliance: BRE (Basic Regular Expressions), ERE (Extended Regular Expressions), and SRE (Simple Regular Expressions). SRE is deprecated, in favor of BRE, as both provide backward compatibility. The subsection below covering the character classes applies to both BRE and ERE.