diff -Naur --exclude='*.pyc' --exclude='*.~*' --exclude=build roundup-1.4.21/roundup/backends/back_postgresql.py roundup-1.4.21.like/roundup/backends/back_postgresql.py
--- roundup-1.4.21/roundup/backends/back_postgresql.py	2012-04-12 03:29:34.000000000 -0700
+++ roundup-1.4.21.like/roundup/backends/back_postgresql.py	2013-05-09 08:40:34.437013352 -0700
@@ -285,6 +285,7 @@
 
 class PostgresqlClass:
     order_by_null_values = '(%s is not NULL)'
+    case_insensitive_like = 'ILIKE'
 
 class Class(PostgresqlClass, rdbms_common.Class):
     pass
diff -Naur --exclude='*.pyc' --exclude='*.~*' --exclude=build roundup-1.4.21/roundup/backends/rdbms_common.py roundup-1.4.21.like/roundup/backends/rdbms_common.py
--- roundup-1.4.21/roundup/backends/rdbms_common.py	2012-08-16 10:49:10.000000000 -0700
+++ roundup-1.4.21.like/roundup/backends/rdbms_common.py	2013-05-09 08:39:54.143013468 -0700
@@ -2317,6 +2317,10 @@
                 multilink_table, ','.join([self.db.arg] * len(v)))
             return where, v, True # True to indicate original
 
+    # Many databases treat LIKE ignoring case. Postgres and Oracle have
+    # an ILIKE operator to support this.
+    case_insensitive_like = 'LIKE'
+
     def _filter_sql (self, search_matches, filterspec, srt=[], grp=[], retr=0):
         """ Compute the proptree and the SQL/ARGS for a filter.
         For argument description see filter below.
@@ -2434,7 +2438,11 @@
 
                     # now add to the where clause
                     where.append('('
-                        +' and '.join(["_%s._%s LIKE '%s'"%(pln, k, s) for s in v])
+                        +' and '.join(["_%s._%s %s '%s'"%(
+                                    pln,
+                                    k,
+                                    self.case_insensitive_like,
+                                    s) for s in v])
                         +')')
                     # note: args are embedded in the query string now
                 if 'sort' in p.need_for:
diff -Naur --exclude='*.pyc' --exclude='*.~*' --exclude=build roundup-1.4.21/test/db_test_base.py roundup-1.4.21.like/test/db_test_base.py
--- roundup-1.4.21/test/db_test_base.py	2012-12-21 02:50:14.000000000 -0800
+++ roundup-1.4.21.like/test/db_test_base.py	2013-05-09 08:19:54.755014541 -0700
@@ -1237,6 +1237,23 @@
             ae(filt(None, {'title': ['one', 'two']}, ('+','id'), (None,None)),
                 [])
 
+    def testFilteringStringCase(self):
+        """
+        Similar to testFilteringString except the search parameters
+        have different capitalization.
+        """
+        ae, filter, filter_iter = self.filteringSetup()
+        for filt in filter, filter_iter:
+            ae(filt(None, {'title': ['One']}, ('+','id'), (None,None)), ['1'])
+            ae(filt(None, {'title': ['Issue One']}, ('+','id'), (None,None)),
+                ['1'])
+            ae(filt(None, {'title': ['ISSUE', 'ONE']}, ('+','id'), (None,None)),
+                ['1'])
+            ae(filt(None, {'title': ['iSSUE']}, ('+','id'), (None,None)),
+                ['1','2','3'])
+            ae(filt(None, {'title': ['One', 'Two']}, ('+','id'), (None,None)),
+                [])
+
     def testFilteringLink(self):
         ae, filter, filter_iter = self.filteringSetup()
         a = 'assignedto'