Support regex

assertions.go

@@ -21,6 +21,8 @@ type tError struct {
 	err error
 }
 
+func (t *tError) Helper() {}
+
 func (t *tError) Errorf(format string, args ...interface{}) {
 	t.err = fmt.Errorf(format, args...) // nolint: goerr113
 }
@@ -44,6 +46,17 @@ func AssertState(t assert.TestingT, state *vt10x.State, expected string) bool {
 	return assert.Equal(t, expected, actual)
 }
 
+// AssertStateRegex asserts console state.
+func AssertStateRegex(t assert.TestingT, state *vt10x.State, expected string) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	actual := trimTailingSpaces(expect.StripTrailingEmptyLines(state.String()))
+
+	return assert.Regexp(t, expected, actual)
+}
+
 func trimTailingSpaces(out string) string {
 	lines := strings.Split(out, "\n")
 

features/console.feature

@@ -1,6 +1,6 @@
 Feature: Console
 
-    Scenario: Captured Output
+    Scenario: Text
         When I write to console:
         """
         Hello World!
@@ -14,3 +14,45 @@ Feature: Console
 
         I'm John
         """
+
+    Scenario: JSON
+        When I write to console:
+        """
+        [
+            {
+                "username": "[email protected]",
+                "password": "123456"
+            }
+        ]
+        """
+
+        Then console output is:
+        """
+        [
+            {
+                "username": "[email protected]",
+                "password": "123456"
+            }
+        ]
+        """
+
+    Scenario: Regex
+        When I write to console:
+        """
+        [
+            {
+                "username": "[email protected]",
+                "password": "123456"
+            }
+        ]
+        """
+
+        Then console output matches:
+        """
+        \[
+            {
+                "username": "[email protected]",
+                "password": "[0-9]+"
+            }
+        \]
+        """

manager.go

@@ -53,6 +53,7 @@ func (m *Manager) RegisterContext(ctx *godog.ScenarioContext) {
 	})
 
 	ctx.Step(`console output is:`, m.isConsoleOutput)
+	ctx.Step(`console output matches:`, m.matchConsoleOutput)
 }
 
 func (m *Manager) session() *session {
@@ -129,6 +130,15 @@ func (m *Manager) isConsoleOutput(expected *godog.DocString) error {
 	return t.LastError()
 }
 
+func (m *Manager) matchConsoleOutput(expected *godog.DocString) error {
+	m.Flush()
+
+	t := teeError()
+	AssertStateRegex(t, m.session().state, expected.Content)
+
+	return t.LastError()
+}
+
 // WithStarter adds a Starter to Manager.
 func (m *Manager) WithStarter(s Starter) *Manager {
 	m.starters = append(m.starters, s)