'[' is a regex metacharacter, so perl's not seeing the statement you think you have. I don't think you could run that without some error message being shown.

Try 

perl -p -i.bak -e"s/\[/\r\n[/g" f:\test.txt

[download]
I can't swear I've got the winders command line syntax right, but I think I do.

After Compline,
Zaxo

In reply to Re: How to inject chr(10) chr(13) into a string by Zaxo
in thread How to inject chr(10) chr(13) into a string by Mark Weimer

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