[R] extracting text contained in brackets ("[ ... ]") from a character string?

From: new ruser <newruser_at_yahoo.com>
Date: Sun, 13 May 2007 13:26:55 -0700 (PDT)

I have a text string that contains text within two brackets.

e.g. "testdata[3]" "testdata[-4]", "testdata[-4g]",

I wish to "extract" the string enclosed in brackets?

What is a good way to do this?


fun(testdata[3]) = '3'

fun(testdata[-4g]) = '-4g'        

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