Use of LOWER Operator in wt.query.SearchCondition

I am new to QuerySpec and SearchCondition.  I have an SQL query that uses the LOWER() operator.  Is it possible to use that operator in the wt.query.SearchCondition?

I have an array of usernames, but they are all in lowercase.  I wish to query the database with the usernames, but in the database, they are stored as mixed case.  Thus sometimes I don't get a result.

SQL:

select name,email from wtuser where lower(name) in ('ben.perry','otheruser1','otheruser2')

Results:

ben.perry ben.perry@company.com

otherUSER1 <email>

OtherUser2 <email>

wt.query.SearchCondition:

(this is a portion of the code in a FOR loop):

wt.query.SearchCondition(wt.org.WTUser.class,wt.org.WTUser.NAME,wt.query.SearchCondition.LIKE,userArray[z])

Results:

ben.perry ben.perry@company.com

<the other users aren't found because userArray[] contains only lowercase characters>