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Robust regex

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  Robust regex "Joseph L. Casale" <jcasale@activenetwerx.com> - 2012-11-19 20:32 +0000
    Re: Robust regex John Gordon <gordon@panix.com> - 2012-11-19 20:50 +0000
      RE: Robust regex "Joseph L. Casale" <jcasale@activenetwerx.com> - 2012-11-19 23:37 +0000

#33551 — Robust regex

Trying to robustly parse a string that will have key/value pairs separated
by three pipes, where each additional key/value (if more than one exists)
will be delineated by four more pipes.

    string = 'key_1|||value_1||||key_2|||value_2'
    regex = '((?:(?!\|\|\|).)+)(?:\|\|\|)((?:(?!\|\|\|).)+)(?:\|\|\|\|)?'

I am not convinced this is the most effective or safest, any opinions would
be greatly appreciated!

jlc

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#33555

In <mailman.7.1353357285.29569.python-list@python.org> "Joseph L. Casale" <jcasale@activenetwerx.com> writes:

> Trying to robustly parse a string that will have key/value pairs separated
> by three pipes, where each additional key/value (if more than one exists)
> will be delineated by four more pipes.
>     string = 'key_1|||value_1||||key_2|||value_2'
>     regex = '((?:(?!\|\|\|).)+)(?:\|\|\|)((?:(?!\|\|\|).)+)(?:\|\|\|\|)?'
> I am not convinced this is the most effective or safest, any opinions would
> be greatly appreciated!

Regexes may be overkill here.  A simple string split might be better:

    string = 'key_1|||value_1||||key_2|||value_2'
    pairs = string.split('||||')
    for pair in pairs:
        keyval = pair.split('|||')
        print '%s=%s' % (keyval[0], keyval[1])

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon@panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"

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#33564

> Regexes may be overkill here.  A simple string split might be better:

Yup, and much more robust as I was looking for.

Thanks everyone!
jlc

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