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16 lines
901 B
Plaintext
16 lines
901 B
Plaintext
LPeg is a new pattern-matching library for Lua, based on Parsing Expression
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Grammars (PEGs).
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Following the Snobol tradition, LPeg defines patterns as first-class objects.
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That is, patterns are regular Lua values (represented by userdata). The library
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offers several functions to create and compose patterns. With the use of
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metamethods, several of these functions are provided as infix or prefix
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operators. On the one hand, the result is usually much more verbose than the
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typical encoding of patterns using the so called regular expressions (which
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typically are not regular expressions in the formal sense). On the other hand,
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first-class patterns allow much better documentation (as it is easy to comment
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the code, to break complex definitions in smaller parts, etc.) and are
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extensible, as we can define new functions to create and compose patterns.
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WWW: http://www.inf.puc-rio.br/~roberto/lpeg/
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