HPCC-16995 PATTERN EscapeQuot := ''''; no longer compiles

Add some test cases.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>

ecl/regress/quququerre.ecl

@@ -0,0 +1,3 @@
+unterminated := '''
+Oops, I forgot to terminate this multiline string;
+

ecl/regress/tpat5e.ecl

@@ -0,0 +1,48 @@
+/*##############################################################################
+
+    HPCC SYSTEMS software Copyright (C) 2012 HPCC Systems®.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+############################################################################## */
+
+//See pp219-> of dragon.
+
+r := record
+  string line;
+  end;
+
+d := dataset([
+{'abc * def + ghi'},
+{'(a + b) * (c + d)'},
+{''}],r);
+
+
+//Example comes from Dragon pp218->
+
+pattern ws := [' ','\t',',','yyy''']*;
+token id := PATTERN('[a-zA-Z]+');
+
+rule beforeId := pattern('');
+rule afterId := pattern('');
+rule E := beforeId id afterId;
+
+
+results := 
+    record
+        beforePos := matchposition(beforeId);
+        afterPos := matchposition(afterId);
+        x := MATCHTEXT(id)+'!';
+    end;
+
+outfile1 := PARSE(d,line,E,results,skip(ws),scan,parse);
+output(outfile1);