improve colon handling

app/src/main/java/eu/kanade/tachiyomi/util/ChapterRecognition.java

@@ -15,7 +15,8 @@ public class ChapterRecognition {
     private static final Pattern withAlphaPostfix = Pattern.compile("(\\d+[\\.,]?\\d*\\s*)([a-z])($|\\b)");
     private static final Pattern cleanNumber = Pattern.compile("(\\d+[\\.,]?\\d+)($|\\b)");
     private static final Pattern uncleanNumber = Pattern.compile("(\\d+[\\.,]?\\d*)");
-    private static final Pattern withColon = Pattern.compile("(\\d+[\\.,]?\\d*\\s*:)");
+    private static final Pattern withColon = Pattern.compile("(\\d+[\\.,]?\\d*\\s*:)([^\\d]|$)");
+    private static final Pattern startingNumber = Pattern.compile("^(\\d+[\\.,]?\\d*)");
 
     private static final Pattern pUnwanted =
             Pattern.compile("(\\b|\\d)(v|ver|vol|version|volume)\\.?\\s*\\d+\\b");
@@ -84,7 +85,7 @@ public class ChapterRecognition {
 
         // Try to remove the manga name from the chapter, and try again
         String mangaName = replaceIrrelevantCharacters(manga.title);
-        String nameWithoutManga = difference(mangaName, name);
+        String nameWithoutManga = difference(mangaName, name).trim();
         if (!nameWithoutManga.isEmpty()) {
             matcher = uncleanNumber.matcher(nameWithoutManga);
             occurrences = getAllOccurrences(matcher);

app/src/test/java/eu/kanade/tachiyomi/ChapterRecognitionTest.java

@@ -179,4 +179,11 @@ public class ChapterRecognitionTest {
         ChapterRecognition.parseChapterNumber(c, randomManga);
         assertThat(c.chapter_number).isEqualTo(-1f);
     }
+
+    @Test
+    public void testChapterWithTime() {
+        Chapter c = createChapter("Fairy Tail 404: 00:00");
+        ChapterRecognition.parseChapterNumber(c, randomManga);
+        assertThat(c.chapter_number).isEqualTo(404f);
+    }
 }