RegexTransformer - need help with regex value

[Pulkit Singhal]

Hello,

Feel free to point me to alternate sources of information if you deem
this question unworthy of the Solr list :)

But until then please hear me out!

When my config is something like:
            <field column="imageUrl"
                   regex=".*img src=.(.*)\.gif..alt=.*"
                   sourceColName="description"
                   />
I don't get any data.

But when my config is like:
            <field column="imageUrl"
                   regex=".*img src=.(.*)..alt=.*"
                   sourceColName="description"
                   />
I get the following data as the value for imageUrl:
http://g-ecx.images-amazon.com/images/G/01/x-locale/common/customer-reviews/stars-5-0._V192240867_.gif";
width="64"

As the result shows, this is a string that should be able to match
even on the 1st regex=".*img src=.(.*)\.gif..alt=.*" and produce a
result like:
http://g-ecx.images-amazon.com/images/G/01/x-locale/common/customer-reviews/stars-5-0._V192240867_
But it doesn't!
Can anyone tell me why that would be the case?
Is it something about the way RegexTransformer is wired or is it just
my regex value that isn't right?