Revert "Swift: Fix two of the qhelps by slightly modifying the sample code instead."

This reverts commit 2d19d6f.

Author: geoffw0

swift/ql/src/queries/Security/CWE-020/IncompleteHostnameRegex.qhelp

@@ -46,7 +46,7 @@
 
 		</p>
 
-		<sample src="IncompleteHostnameRegexBad.swift"/>
+		<sample src="IncompleteHostnameRegexBad.swift" language=""/>
 
 		<p>
 
@@ -63,7 +63,7 @@
 
 		</p>
 
-		<sample src="IncompleteHostnameRegexGood.swift"/>
+		<sample src="IncompleteHostnameRegexGood.swift" language=""/>
 
 	</example>
 

swift/ql/src/queries/Security/CWE-020/IncompleteHostnameRegexBad.swift

@@ -1,11 +1,11 @@
 
-func handleUrl(_ urlString: String) throws {
+func handleUrl(_ urlString: String) {
     // get the 'url=' parameter from the URL
     let components = URLComponents(string: urlString)
     let redirectParam = components?.queryItems?.first(where: { $0.name == "url" })
 
     // check we trust the host
-    let regex = try Regex("^(www|beta).example.com/") // BAD
+    let regex = #/^(www|beta).example.com//#  // BAD
     if let match = redirectParam?.value?.firstMatch(of: regex) {
         // ... trust the URL ...
     }

swift/ql/src/queries/Security/CWE-020/IncompleteHostnameRegexGood.swift

@@ -1,11 +1,11 @@
 
-func handleUrl(_ urlString: String) throws {
+func handleUrl(_ urlString: String) {
     // get the 'url=' parameter from the URL
     let components = URLComponents(string: urlString)
     let redirectParam = components?.queryItems?.first(where: { $0.name == "url" })
 
     // check we trust the host
-    let regex = try Regex("^(www|beta)\\.example\\.com/") // GOOD
+    let regex = #/^(www|beta)\.example\.com//#  // GOOD
     if let match = redirectParam?.value?.firstMatch(of: regex) {
         // ... trust the URL ...
     }

swift/ql/src/queries/Security/CWE-116/BadTagFilter.qhelp

@@ -28,7 +28,7 @@ likely to handle corner cases correctly than a custom implementation.
 The following example attempts to filters out all <code>&lt;script&gt;</code> tags.
 </p>
 
-<sample src="BadTagFilterBad.swift" />
+<sample src="BadTagFilterBad.swift" language="" />
 
 <p>
 The above sanitizer does not filter out all <code>&lt;script&gt;</code> tags.

swift/ql/src/queries/Security/CWE-116/BadTagFilterBad.swift

@@ -1,4 +1,4 @@
-let script_tag_regex = try Regex("<script[^>]*>.*</script>")
+let script_tag_regex = /<script[^>]*>.*<\/script>/
 
 var old_html = ""
 while (html != old_html) {