Combining SUBSTRING and LOCATE functions

SELECT SUBSTRING(Data, LOCATE('mssql_',Data), (LOCATE(')', Data) - LOCATE('mssql_',Data) +1)   FROM `mssql` WHERE 1

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Basically I created a MySQL table that houses records that have PHP lines of code with MSSQL Function calls in them. So the records may look like this:

AutoID | Data
1          |  $connection = mssql_connect($server, $user, $pwd);
2          |  $result = mssql_query($query, $mssqlconn);

Something like that. Basically I am just trying to get the mssql_ function and its parameters returned in a result (so the first record would return "mssql_connect($server, $user, $pwd)". I *thought* the above query would do it, but it's giving me an error.

Anyone know what I'm doing wrong?