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Keeping your regular expressions simple
There's something macho about programmers when it comes to regular expressions - so often they'll try and do the whole job in a single regular expression when doing a two stage process is much more logical, much quicker in operation, and far easier to code. Take a requirement that came up this morning, for example, to extract data from a netlist. The data to be handled might look like: [5560] = !V5*V6*V7*!V8 + [5223] and the requirement is to return a list elements separated by = or + signs, and then to return a list of nodes or inputs within those elements. In other words, what's wanted is: ['5560'] ['!V5', 'V6', 'V7', '!V8'] ['5223'] I think I have rather made my point already by how I described the requirement, haven't I? Two regular expressions ... I'm running a Python course, so the example's in Python ... full source code and more Python regular expression examples available! (written 2006-04-05 12:15:18) Associated topics are indexed under Q806 - Regular Expression CookbookY115 - Additional Python Facilities
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Melksham, WiltshireAdding PHP tags to an old cgi program Wiltshire to get an extra MP Helicopter views and tartans Keeping your regular expressions simple Both ends of the animal Architectural Heritage - Devizes The best Open Source library in town Python - block insets help with documentation Well House Manor goes ahead |
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