I'm very much an amateur with grep.

How do I find the optional minus and put it in the subpattern?

I want to grab the time in the following and then use it for the name.
Multiple names in the document. I seem to have it except for finding
the optional minus sign that can occur with ele, lat and lon. I've
only tried for lon so far and once I have the answer I'll expand it to
the others. I get errors if I put the minus within the parentheses. I
tried a -? within the parentheses too. How do I find the optional
minus and put it in the subpattern?

Typical document snippet (.gpx which is XML):

<name>ACTIVE LOG133853</name>
<trkseg>
<trkpt lat="33.846701" lon="-118.387723">
<ele>16.652</ele>
<time>2010-05-15T20:38:53Z</time>
</trkpt>
</trkseg>
</trk>
<trk>
<name>ACTIVE LOG133905</name>
<trkseg>
<trkpt lat="33.846273" lon="-118.387273">
<ele>16.697</ele>
<time>2010-05-15T20:39:05Z</time>
</trkpt>
<trkpt lat="33.846477" lon="-118.387105">
<ele>16.652</ele>
<time>2010-05-15T20:39:10Z</time>
</trkpt>
<trkpt lat="33.846606" lon="-118.387037">
<ele>17.152</ele>
<time>2010-05-15T20:39:16Z</time>
</trkpt>
<trkpt lat="33.846673" lon="-118.387212">
<ele>17.294</ele>
<time>2010-05-15T20:39:23Z</time>
</trkpt>
<trkpt lat="33.846595" lon="-118.387456">
<ele>16.901</ele>
<time>2010-05-15T20:39:29Z</time>
</trkpt>

My find:
<name>ACTIVE LOG[1-9]+</name>
<trkseg>
<trkpt lat\=\"(\d+\.\d+)\" lon\=\"\-(\d+\.\d+)\">
<ele>(\d+\.\d+)</ele>
<time>(.*?)</time>
</trkpt>

My replace
<name>\4 ACTIVE LOG</name>
<trkseg>
<trkpt lat=\"\1\" lon=\"\2\">
<ele>\3</ele>
<time>\4</time>
</trkpt>

This doesn't give errors but I can't find the optional minus and put
it back in the replace. Maybe I'm going at this all wrong.

Thanks for any help.

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