Hi,

I have a string with brackets inside it. Now, when a string has more than 1 bracket pairs I would like to: 1) Take away two consecutive closing and opening bracket, 2) Replacing the characters in between with "N" -- as many as the characters to be repaced. Here is the example 
my $input_str1 = "TG[CCC]CC[TTT]";

# Desired result is this:

my $rep1 = "TG[CCCNNTTT]";  
# Two Ns replace two Cs in between ][.

# Similarly 
my $input_str2 = "TG[CCC][TTT]";
my $rep2 = "TG[CCCTTT]";

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But when there are only 1 bracket pairs, I want to leave it intact: 
my $input_str3 = "TG[CCAAATTT]";

# Desired result is this:

my $rep3 = "TG[CCAAATTT]";

[download]
I have this, but it doesn't work. 
$str =~ s/\][ATCG]+\[/N/;

[download]
Is there a single regex stroke that can handle above situations?

Regards,
Edward

In reply to Quantified Regex Replacement by monkfan

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