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From Harold Putman <hput...@lexmark.com>
Subject Re: Update property value in file and retaining format.
Date Wed, 18 Jan 2012 19:50:48 GMT
These are Regular Expression "metacharacters"

^ means start of line
$ means end of line
\1 is a "backreference" used in substitution. It means insert the first
part of the pattern than matches.

If you Google or look up a book on Regular Expressions you will find more
complete explanations of these things.

-Harold

On Wed, Jan 18, 2012 at 11:46 AM, Nehal Patel <nehalhpatel.ct@gmail.com>wrote:

> Nice, this was the solution!
> Frankly this is a bit more advanced that i know.
>
> I don't know the following:
> What the "^" means.
> What the "$" means.
> What the "\1" means.
>
>
> Thanks.
>
> On Mon, Jan 16, 2012 at 4:38 AM, Emma Burrows <Emma.Burrows@rpharms.com
> >wrote:
>
> > You're replacing the entire "Test2<tab><tab>=" line with the string
> > "test2=xxxxx" which obviously doesn't contain the tab characters.
> >
> > You should probably investigate more sophisticated ways of preserving the
> > original tabs like
> >
> > match="^([ \t]*test2[ \t]*=)(.*)$"
> > replace="\1xxxxxxx"
> >
> > I haven't tested it but something like that should preserve "test2" and
> > all the tabs around it, while still replacing the bit you actually want
> to
> > change, which is whatever comes after the = sign.
> >
> > HTH!
> >
> >
> > -----Original Message-----
> > From: Nehal Patel [mailto:nehalhpatel.ct@gmail.com]
> > Sent: 13 January 2012 23:01
> > To: user@ant.apache.org
> > Subject: Update property value in file and retaining format.
> >
> > Hello,
> > Having an problem updating the value of in a property file and
> > retaining the format.  For example i have the following
> > stuff.properties:
> > test1  <tab> <tab> <tab> =aaa
> > test2  <tab> <tab> <tab> =bbb
> > test3  <tab> <tab> <tab> =ccc
> >
> >
> > I run the following:
> >        <target name="update-stuff-properties">
> >                <replaceregexp file="stuff.properties"
> >                        match="^[ \t]*test2[ \t]*=.*$"
> >                        replace="test2=zzzzzzzz"
> >                        byline="true"
> >                />
> >        </target>
> >
> >
> > I get the following:
> > test1  <tab> <tab> <tab> =aaa
> > test2=zzzzzzzz
> > test3  <tab> <tab> <tab> =ccc
> >
> >
> > I must be missing something on how to retain the "  <tab> <tab> <tab>
> > " which proceed the "=".
> >
> > Thanks.
> >
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>



-- 
Harold PUTMAN
Web Technology Specialist
*Lexmark International, Inc. <http://www.lexmark.com>*
740 W New Circle Rd.
Lexington, KY 40550
+1(859) 232-2839
hputman@lexmark.com

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