LEX and YACC -> Dynamic ???

Hello. There is the following problem. I have to search a ASCII-File
(later perhaps a database) for various pattern and have to generate
various actions depending on the search result. With the tools LEX and
YACC there is only a static possibility, which means that I have to
compile new every time I have a new search pattern.


What dynamic possibilities are there to do this on the fly without
compiling new or are threre already any tools available that pass my
requirements?


Thanks says Lars Zapf
[We just covered this; there were several languages in the 1970s with
syntax that could be extended on the fly. -John]

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