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Re: grimace: a fluent regular expression generator in Python

Joshua Landau
Posts: n/a
On 15 July 2013 23:21, Ben Last <(E-Mail Removed)> wrote:
> Hi all
> I'd be interested in comments on a fluent regular expression generator I've
> been playing with (inspired by the frustrations of a friend of mine who's
> learning).
> The general use case is to be able to construct RE strings such as:
> r'^\(\d{3,3}\)-{1,1}\d{3,3}\-{1,1}\d{4,4}$' (intended to match North
> American phone number)
> as:
> from grimace import RE
> north_american_number_re = (
> RE().start
> .literal('(').followed_by.exactly(3).digits.then.l iteral(')')
> end
> .as_string()
> )

This looks really busy. How about something more like:

from grimace import RE, start, digits, dash, end
RE(start, "(", digits[3], ")-", digits[3], dash, digits[4], end).as_string()


and then you can do cool stuff like (Regex completely untested, I
hardly use the things):

RE((start | tab), (digits[:], inverse(dash)[4])[:2]) →

> The intent is to provide clarity: since the strings would normally be
> generated and compiled when a module is first imported, there's minimal
> overhead.
> It's on github at and the first blog post
> that explains it is here: (I've
> added to it since then).
> Tests are the best explanation, and they're in the __init__ at the end so
> that they're self-executing if the init is executed.
> I'm thinking about other features to implement, and more use cases would be
> welcome.
> Cheers
> ben
> --

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