--- a/ChangeLog	Wed Apr 27 11:37:03 2011 +0200
+++ b/ChangeLog	Wed Apr 27 12:24:42 2011 +0200
@@ -4,7 +4,7 @@
 --
 * support != operator for non equality
 * support for CAST function
-
+* support for regexp-based pattern matching using a REGEXP operator
 
 2011-01-12  --  0.28.0
     * enhance rewrite_shared_optional so one can specify where the new identity

--- a/nodes.py	Wed Apr 27 11:37:03 2011 +0200
+++ b/nodes.py	Wed Apr 27 12:24:42 2011 +0200
@@ -481,7 +481,7 @@
         self.optional= value
 
 
-OPERATORS = frozenset(('=', '!=', '<', '<=', '>=', '>', 'ILIKE', 'LIKE'))
+OPERATORS = frozenset(('=', '!=', '<', '<=', '>=', '>', 'ILIKE', 'LIKE', 'REGEXP'))
 
 class Comparison(HSMixin, Node):
     """handle comparisons:

--- a/parser.g	Wed Apr 27 11:37:03 2011 +0200
+++ b/parser.g	Wed Apr 27 12:24:42 2011 +0200
@@ -88,7 +88,7 @@
     token FALSE:       r'(?i)FALSE'
     token NULL:        r'(?i)NULL'
     token EXISTS:      r'(?i)EXISTS'
-    token CMP_OP:      r'(?i)<=|<|>=|>|!=|=|~=|LIKE|ILIKE'
+    token CMP_OP:      r'(?i)<=|<|>=|>|!=|=|~=|LIKE|ILIKE|REGEXP'
     token ADD_OP:      r'\+|-'
     token MUL_OP:      r'\*|/'
     token FUNCTION:    r'[A-Za-z_]+\s*(?=\()'

--- a/parser.py	Wed Apr 27 11:37:03 2011 +0200
+++ b/parser.py	Wed Apr 27 12:24:42 2011 +0200
@@ -1,22 +1,8 @@
-# copyright 2004-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
-# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
-#
-# This file is part of rql.
-#
-# rql is free software: you can redistribute it and/or modify it under the
-# terms of the GNU Lesser General Public License as published by the Free
-# Software Foundation, either version 2.1 of the License, or (at your option)
-# any later version.
-#
-# rql is distributed in the hope that it will be useful, but WITHOUT ANY
-# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
-# A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
-# details.
-#
-# You should have received a copy of the GNU Lesser General Public License along
-# with rql. If not, see <http://www.gnu.org/licenses/>.
 """yapps input grammar for RQL.
 
+:organization: Logilab
+:copyright: 2003-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
 
 
 Select statement grammar
@@ -109,7 +95,7 @@
         ('FALSE', re.compile('(?i)FALSE')),
         ('NULL', re.compile('(?i)NULL')),
         ('EXISTS', re.compile('(?i)EXISTS')),
-        ('CMP_OP', re.compile('(?i)<=|<|>=|>|!=|=|~=|LIKE|ILIKE')),
+        ('CMP_OP', re.compile('(?i)<=|<|>=|>|!=|=|~=|LIKE|ILIKE|REGEXP')),
         ('ADD_OP', re.compile('\\+|-')),
         ('MUL_OP', re.compile('\\*|/')),
         ('FUNCTION', re.compile('[A-Za-z_]+\\s*(?=\\()')),
@@ -709,7 +695,7 @@
     P = Hercule(HerculeScanner(text))
     return runtime.wrap_error_reporter(P, rule)
 
-if __name__ == 'old__main__':
+if __name__ == '__main__':
     from sys import argv, stdin
     if len(argv) >= 2:
         if len(argv) >= 3:
@@ -719,25 +705,3 @@
         print parse(argv[1], f.read())
     else: print >>sys.stderr, 'Args:  <rule> [<filename>]'
 # End -- grammar generated by Yapps
-"""Main parser command.
-
-"""
-__docformat__ = "restructuredtext en"
-
-if __name__ == '__main__':
-    from sys import argv
-
-    parser = Hercule(HerculeScanner(argv[1]))
-    e_types = {}
-    # parse the RQL string
-    try:
-        tree = parser.goal(e_types)
-        print '-'*80
-        print tree
-        print '-'*80
-        print repr(tree)
-        print e_types
-    except SyntaxError, ex:
-        # try to get error message from yapps
-        from yapps.runtime import print_error
-        print_error(ex, parser._scanner)