From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kyle Meyer <kyle@kyleam.com>
Subject: Re: How to escape "[" and "]" characters in org-mode links
Date: Wed, 29 Jul 2015 11:55:19 -0400
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	(Ivanov Dmitry's message of "Wed, 29 Jul 2015 15:02:23 +0300")
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To: Ivanov Dmitry <usr345@gmail.com>
Cc: Xiha <xiha@laposte.net>, emacs-orgmode@gnu.org

Ivanov Dmitry <usr345@gmail.com> wrote:
> Hi, Xiha
>
> Unfortunately URL encoding the [ and ] doesn't work for me. Try to
> reproduce it. Create 2 files:
>
> file.txt. Content:
> --------------------------------
> $form['text1']
>
> $form['text2']
> --------------------------------
> file.org. Content:
> --------------------------------
> [[./file.txt::$form%5B'text2'%5D][text2]]
> --------------------------------
>
> When I click the link, it says "No match".

While the search string is escaped elsewhere in org-link-search using
regexp-quote, it is treated as a regular expression for normal text
search.  Try escaping with "\":

    [[./file.txt::$form\%5B'text2'\%5D]]

--
Kyle