JavaScript: Fix getDelimiterMatchingRegexp to work on multi-line strings.

javascript/ql/src/semmle/javascript/frameworks/Templating.qll

@@ -37,6 +37,6 @@ module Templating {
    * storing it in its first (and only) capture group.
    */
   string getDelimiterMatchingRegexp() {
-    result = ".*(" + concat("\\Q" + getADelimiter() + "\\E", "|") + ").*"
+    result = "(?s).*(" + concat("\\Q" + getADelimiter() + "\\E", "|") + ").*"
   }
 }

javascript/ql/test/query-tests/Security/CWE-313/tst8.yml

@@ -0,0 +1,6 @@
+config: |
+    [mail]
+    host = smtp.mydomain.com
+    port = 25
+    username = {{username}}
+    password = {{pwd}}