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...@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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