From: m b <snert@...>
Date: 2011-06-14T03:05:46+09:00
Subject: Re: Regexp.match(line) question

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> > if I do this:
> >
> > f=3Dopen('filename.dat'=2C'r')
> > str=3Df.read
> >
> > and then:
> >
> > str.each_line  do |line|
> >    /ruby/.match(line)
> >
> > ruby prints out variable line and say its a RegexpError
> > 'empty range in character class'  as if it interprets  line as a Regexp
> > What am I doing wrong?  There are a lot of strange characters in variab=
le line=2C
> > maybe that is the issue?
>=20
> I'm not sure about the issue=2C but the usual idiom for this is:
>=20
> File.foreach("filename.dat") do |line|
>   line.match(/ruby/)
> end
>=20
> This way:
> - The file handler is automatically closed for you=2C you don't have to
> ensure that you call close on it=2C it's done for you.
> - You only have one line at a time in memory=2C since that seems to be
> your unit of data. If the file is huge it will make a difference in
> the amount of memory you will consume at a time.
>=20
> In any case=2C String#match calls Regexp#match=2C so calling match on one
> or the other should make no difference. Can you show a small example
> of a file that breaks?
>=20
> Jesus.


Aha..  Thats a better way to do it..  File.foreach   Thanx.



the string-variable  line  both starts and and ends with a '/'   .     Its =
a series of paths from a linux system  hd  =20

But its a String to be searched  and not a Regexp




 		 	   		  =

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