like (non-case-sensitive)

[Andrew Vandever]

I'm trying to set up a search function in a PHP-based, blog-like app, and want to make the search not be case-sensitive. The line currently reads:
WHERE pst_sbjt regexp 'SearchString' OR pst_cont regexp 'SearchString'
I tried before:
WHERE pst_sbjt like'%SearchString%' OR pst_cont like'%SearchString%'
both return case-sensitive results. How do I make it non-case-sensitive?
Is there a reference somewhere for all the %-like modifiers available?
Thanks.