borges2003xx <at> yahoo.it <borges2003xx <at> yahoo.it> writes:
> > but in general is there a way to include in a re, in this example > something like...matches iff p , and q in which p==q[::-1] ? A way to > putting a small part of code of python in re? Thanx for your many helps What you are after is a parser - there are plenty available. I prefer spark, but pyparsing has gained lots of attention lately and is AFAIK the quasi-standard. The problem you described is a classical instance of a so-called context-free grammar. There is absolutely _no_ way to teach regular expressions how to detect words created based on a grammar of that kind. Really. It won't work. So - either use a parser, or write a simple one yourself - the code above qualifies as an attempt to do so. Regards, Diez -- http://mail.python.org/mailman/listinfo/python-list
