Expanding Variables in if statements

hi
I'm trying to check if a source string contains a substring, inside an <if>
statement, but it doesn't seem to work when the source string is a variable

I have:
    <property name="dir.base" value="this/is/my/working/directory" />
    <if test="${string::contains('${dir.base}','working')}">
      <echo>This is my directory</echo>
    </if>

This never returns true. It doesn't seem to parse the ${dir.base} variable
inside the <if> statement

If I change the test to:
    <if test="${string::contains('${dir.base}','base')}">
      <echo>This is my directory</echo>
    </if>

This does return true. So, it appears to treat the variable as a literal and
not a variable.

Am I missing something? I tried removing the single quotes around
${dir.base} and got an error about the $ character. I also tried using
double quotes, but got an error as well

Is there a better way to check if a string (or path) contains a specific
directory?

thanks
Michael

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