Add support for regex in response_strings

Very similar to what is used for headers.

Fixes #326

gabbi/handlers/core.py

@@ -22,8 +22,20 @@ class StringResponseHandler(base.ResponseHandler):
     test_key_value = []
 
     def action(self, test, expected, value=None):
-        expected = test.replace_template(expected)
-        test.assert_in_or_print_output(expected, test.output)
+        is_regex = (expected.startswith('/') and
+                    expected.endswith('/') and
+                    len(expected) > 1)
+        expected = test.replace_template(expected, escape_regex=is_regex)
+
+        if is_regex:
+            # Trim off /
+            expected = expected[1:-1]
+            test.assertRegex(
+                test.output, expected,
+                'Expect resonse body %s to match /%s/' %
+                (test.output, expected))
+        else:
+            test.assert_in_or_print_output(expected, test.output)
 
 
 class ForbiddenHeadersResponseHandler(base.ResponseHandler):

gabbi/tests/gabbits_intercept/regex.yaml

@@ -1,4 +1,4 @@
-# Confirm regex handling in response and json path headers
+# Confirm regex handling in response headers, strings and json path handlers
 tests:
 - name: regex header test
   url: /cow?alpha=1
@@ -19,3 +19,30 @@ tests:
     $.alpha: /ow$/
     $.beta: /(?!cow).*/
     $.gamma: /\d+/
+
+- name: regex string test json
+  PUT: /cow
+  request_headers:
+    content-type: application/json
+  data:
+    alpha: cow
+    beta: pig
+    gamma: 1
+  response_strings:
+    - '/"alpha": "cow",/'
+
+- name: regex string test multiline
+  GET: /presenter
+  response_strings:
+    - '/Hello World/'
+    - '/dolor sit/'
+
+- name: regex string test splat
+  GET: /presenter
+  response_strings:
+    - '/dolor.*amet/'
+
+- name: regex string test mix
+  GET: /presenter
+  response_strings:
+    - '/[Hh]el{2}o [Ww]orld/'