Fetching attribute value from property using ant - may be with propertyregex - ant

Question

I tried using linecontainsregexp within filterchain ant-task by framing regexp pattern holding unique server name say 'act1' & now property holds value like this:
<Server name="act1" value="ServerName" port="1234"></Server>
How to get individual attribute names?. For eg if I want to get port #, how to retrieve it. I tried with something like:
<propertyregex property="extracted.prop" input="${server.details}"
regexp="(.*)\\ *##" select="\1" />
thank you.

Answer 1

The code below should work to extract each of the three attributes. First, notice that I'm loading the entire xml file. It isn't necessary to extract the specific line as you were doing. Secondly, I wrote it to be flexible enough to allow line breaks in the Server properties and to allow any order of the attributes.
I see that you were really struggling with the regex in particular. For your understanding, I'll break down the first regex:
(?s) // DOTALL flag. Causes the . wildcard to match newlines.
\x3c // The < character. For reasons I don't understand, `propertyregex` doesn't allow <
Server // Match 'Server' literally
.*? // Reluctantly consume characters until...
name= // 'name=' is reached
" // Because ant is an XML file, we must use this escape sequence for "
(.*?) // Reluctantly grab all characters in a capturing group until...
" // another double quote is reached.
And finally the XML:
<loadfile property="server.details" srcfile="${baseDir}/build/myTest.xml"/>
<propertyregex property="server.name"
input="${server.details}"
regexp="(?s)\x3cServer.*?name="(.*?)""
select="\1" />
<propertyregex property="server.value"
input="${server.details}"
regexp="(?s)\x3cServer.*?value="(.*?)""
select="\1" />
<propertyregex property="server.port"
input="${server.details}"
regexp="(?s)\x3cServer.*?port="(.*?)""
select="\1" />