MySQL regex to return matching string only - mysql

Question

I'm building a query to run in an Invision Power Board hosted site using the SQL Toolbox, unfortunately it seems a but limited and I've not been able to add custom SQL function so far. I've built a mutli-table query but for the sake of simplicity will simplify it here.
The following is a sample of the database and a query to find profiles which include an address in their About Me (field_11) profile using Regex. The results shows the entirety of the About Me and not just the matching string.
Is there a way to structure the query to return just the matching string found by regex without using a bespoke MySQL function?
SQL Database
CREATE TABLE core_pfields_content
(`field_11` LONGTEXT);
INSERT INTO core_pfields_content
(`field_11`)
VALUES
('<p> C++ eveloper</p> <p> AJ4ndBBLJZmRDVtC7JfGAVivhUXFDvWqKL </p>'),
('<p> Norwegian designer and illustrator working out of Oslo. </p>'),
('<p> Hello everyone, I am a Freelancer Photographer </p> <p> My portfolio: </p> <p> address: AW7fvzoEWAfiyyEwgXmgog525NCCeAxVmG </p>');
Query
SELECT field_11
FROM core_pfields_content
WHERE field_11 REGEXP '^.*([A][a-km-zA-HJ-NP-Z1-9]{26,33}).*';
Result
field_11
<p> C++ eveloper</p> <p> AJ4ndBBLJZmRDVtC7JfGAVivhUXFDvWqKL </p>
<p> Hello everyone, I am a Freelancer Photographer </p> <p> My portfolio: </p> <p> address: AW7fvzoEWAfiyyEwgXmgog525NCCeAxVmG </p>
http://sqlfiddle.com/#!9/02d1d/1