Assuming the "name" is the LAST entry inside square brackets, you can use something like this: 
 perl -e '(@x)=$ARGV[0]=~/\[(.*?)\]/g; print qq|$x[$#x];\n|' "enoyl-[a
+cyl-carrier-protein] reductase [NADH] 2 [Silicibacter sp. TrichCH4B].
+ "
#--output---
Silicibacter sp. TrichCH4B;

[download]
Also, the regular expression is probably better written as: 
    /\[([^\]]+)\]/

[download]
(But that assumes matching "]" are guaranteed.)

             All great truths begin as blasphemies.
                   ― George Bernard Shaw, writer, Nobel laureate (1856-1950)

In reply to Re: regular expression by NetWallah
in thread regular expression by ssharma

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