From: Shashank Date <sdate@...>
Date: 2002-10-22T20:16:42+09:00
Subject: Re: newby asks: giving regexps as argument for funvtions

This worked for me  under ruby 1.7.2 (2002-07-02) [i386-mswin32]:

def findPosRE(str, re)
    m = re.match(str)
    return m.begin(0)
end

pos = findPosRE("hey you behind the wall", /behind/)
puts pos      # prints 8


"T-Online" <daniel.schnell@embeddedware.de> wrote in message
news:ap3a59$dm4$06$1@news.t-online.com...
> Hi this is a newby question:
>
> i want to pass a regular expression as a parameter to ruby. Tthe following
> code snippet can be made easier but it shows the principle I want to
> understand:
>
> def     findPosRE(str, re)
>     m = %r{re}.match(str)
>     return m.begin(0)
> end
>
>
> pos = findPosRE ("hey you behind the wall", "/behind/")
>
>
> This gives the error:
>
> -->undefined method 'begin' for nil (NameError)
>
> How I convince ruby that the local variable m is a MatchData object, so
the
> begin() method can be sent to m ?
>
> Ciao,
>
> Daniel.
>
>