Hi, here's how you can figure out where one starts and begins by looking for:
{\"
mirror\":\"Manga Here\",\"name\":\"12 Beast\",\"url\":\"http://www.mangahere.com/manga/12_beast/\",\"lastChapterReadURL\":\"http://www.mangahere.co/manga/12_beast/c007/\",\"lastChapterReadName\":null,\"read\":0,\"update\":1,\"ts\":1399634797,\"display\":0,\"cats\":\"[]\"
},{ this is a beginning bracket and
} this a ending
as well as having the comma at the end in this case.
also just looking for the word mirror is easy too

to find errors I would look for certain text within and calculated the numbers... took a bit but worked! Oh I use text and the find to do this

for instance search "Manga Here" it come up with 20 results.
next search the url, "http://www.mangahere.co/ and if you come up short 39 (you double 20)
You can use the find and see where only one text is highlighted within a 'mirror'
Actually is this data you supplied this 'mirror' has an error. one url is com when it should be co
KEEP the original data download just incase you mess your .txt up!
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I'm also not sure why but AMR isn't importing on my browser, if anyone knows why?