Improved solution to issue #179 (invalid options throwing errors in joinRegExp)

This slightly more robust solution ignores options that are not strings
or regular expressions in the passed patterns array.

The prior solution still accepted non-string, non-regexp options (e.g.
[], {}, true, etc.).

Credit goes to @soundslocke for the fix.

Author: johnbacon

src/raven.js

@@ -644,14 +644,15 @@ function joinRegExp(patterns) {
     // Be mad.
     var sources = [], i = patterns.length;
     while (i--) {
-        if (!isUndefined(patterns[i]) && patterns[i]) {
-            sources[i] = isString(patterns[i]) ?
-                // If it's a string, we need to escape it
-                // Taken from: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
-                patterns[i].replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1") :
-                // If it's a regexp already, we want to extract the source
-                patterns[i].source;
+        if (isString(patterns[i])) {
+            // If it's a string, we need to escape it
+            // Taken from: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
+            sources.unshift(patterns[i].replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1"));
+        } else if (!isUndefined(patterns[i]) && patterns[i] && patterns[i].source) {
+            // If it's a regexp already, we want to extract the source
+            sources.unshift(patterns[i].source);
         }
+        // Intentionally skip other cases
     }
     return new RegExp(sources.join('|'), 'i');
 }

test/raven.test.js

@@ -879,6 +879,12 @@ describe('globals', function() {
                 'a', 'b', null, undefined
             ]).source, 'a|b');
         });
+
+        it('should skip entries that are not strings or regular expressions in the passed array of patterns', function() {
+            assert.equal(joinRegExp([
+                'a', 'b', null, 'a.b', undefined, true, /d/, 123, {}, /[0-9]/, []
+            ]).source, 'a|b|a\\.b|d|[0-9]');
+        });
     });
 });