Add support for regex.QuoteMeta string conversion

docs/strings.md

@@ -446,6 +446,17 @@ The above produces `[pi a]`
 `regexSplit` panics if there is a problem and `mustRegexSplit` returns an error to the
 template engine if there is a problem.
 
+## regexQuoteMeta
+
+Returns a string that escapes all regular expression metacharacters inside the argument text;
+the returned string is a regular expression matching the literal text.
+
+```
+regexQuoteMeta "1.2.3"
+```
+
+The above produces `1\.2\.3`
+
 ## See Also...
 
 The [Conversion Functions](conversion.html) contain functions for converting

regex.go

@@ -77,3 +77,7 @@ func mustRegexSplit(regex string, s string, n int) ([]string, error) {
 	}
 	return r.Split(s, n), nil
 }
+
+func regexQuoteMeta(s string) string {
+	return regexp.QuoteMeta(s)
+}

regex_test.go

@@ -196,3 +196,8 @@ func TestMustRegexSplit(t *testing.T) {
 		assert.Equal(t, c.expected, len(res), "case %#v", c.args)
 	}
 }
+
+func TestRegexQuoteMeta(t *testing.T) {
+	assert.Equal(t, "1\\.2\\.3", regexQuoteMeta("1.2.3"))
+	assert.Equal(t, "pretzel", regexQuoteMeta("pretzel"))
+}