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GNU sed - sed (stream editor) is a Unix utility that parses text and implements a programming language which...
GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
TXR - Pragmatic, convenient data munging language.
Gema - General purpose text macro processor.
SNR (Search-n-Replace) - SNR is a free Windows command-line utility that performs multiple string-replacement operations on a data file in a single pass.
GCC C Preprocessor (cpp) - Top (The C Preprocessor)