The F# Journal just published an article about lexing:
"The .NET Framework provides functions to parse primitive types including floating point numbers. These functions all adhere to the same API: the string being parsed must hold only the number. This simple API is fine for prototyping and production when performance does not matter but practical applications often lex streams of input containing numbers and, therefore, benefit from the ability to parse a number that is a substring in a given string with a specific starting index and length. This article looks at the design and implementation of a function to lex a sequence of floating point numbers from a string and compares the performance with a version that uses the built-in parsing functions..."
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