Respect default merge message syntax when parsing item references (#15772)

* Respect merge message structure for parsing item references

Signed-off-by: JustusBunsi <61625851+justusbunsi@users.noreply.github.com>
Co-authored-by: zeripath <art27@cantab.net>

modules/references/references.go

@@ -29,7 +29,7 @@ var (
 	// mentionPattern matches all mentions in the form of "@user" or "@org/team"
 	mentionPattern = regexp.MustCompile(`(?:\s|^|\(|\[)(@[0-9a-zA-Z-_]+|@[0-9a-zA-Z-_]+\/?[0-9a-zA-Z-_]+|@[0-9a-zA-Z-_][0-9a-zA-Z-_.]+\/?[0-9a-zA-Z-_.]+[0-9a-zA-Z-_])(?:\s|[:,;.?!]\s|[:,;.?!]?$|\)|\])`)
 	// issueNumericPattern matches string that references to a numeric issue, e.g. #1287
-	issueNumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[)([#!][0-9]+)(?:\s|$|\)|\]|[:;,.?!]\s|[:;,.?!]$)`)
+	issueNumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[|\')([#!][0-9]+)(?:\s|$|\)|\]|[:;,.?!]\s|[:;,.?!]$)`)
 	// issueAlphanumericPattern matches string that references to an alphanumeric issue, e.g. ABC-1234
 	issueAlphanumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[)([A-Z]{1,10}-[1-9][0-9]*)(?:\s|$|\)|\]|:|\.(\s|$))`)
 	// crossReferenceIssueNumericPattern matches string that references a numeric issue in a different repository

modules/references/references_test.go

@@ -197,6 +197,13 @@ func TestFindAllIssueReferences(t *testing.T) {
 				{200, "user3", "repo4", "200", false, XRefActionNone, &RefSpan{Start: 5, End: 20}, nil, ""},
 			},
 		},
+		{
+			"Merge pull request '#12345 My fix for a bug' (!1337) from feature-branch into main",
+			[]testResult{
+				{12345, "", "", "12345", false, XRefActionNone, &RefSpan{Start: 20, End: 26}, nil, ""},
+				{1337, "", "", "1337", true, XRefActionNone, &RefSpan{Start: 46, End: 51}, nil, ""},
+			},
+		},
 		{
 			"Which abc. #9434 same as above",
 			[]testResult{