CODEWITHSUNDEEP
ruby
LewlSauce
LewlSauce

Reputation: 5882

How to get gsub to replace IP address, rather than just a part of an IP address?

Here's my sample data:

192.168.1.1
192.168.1.11

In bash, I could simply do cat file.txt | grep -w 192.168.1.1 and it will only grab 192.168.1.1, not 192.168.1.11

However, in Ruby, when I'm trying to replace 192.168.1.1, it actually replaces 192.168.1.11 as well. Here's what I'm doing:

replace_array = ['192.168.1.1','x','xx','xx]
replace_array.each {|s| data.gsub!(/#{s}/i, "[redacted]")}

but this leaves 192.168.1.11 looking like [redacted]1 as shown in the example below:

2.5.8 :005 > replace_array = ["192.168.1.1","x","xx","xxx"]
 => ["192.168.1.1", "x", "xx", "xxx"]
2.5.8 :006 > data = "192.168.1.1\n192.168.1.11"
 => "192.168.1.1\n192.168.1.11"
2.5.8 :007 > replace_array.each {|s| data.gsub!(/#{s}/i, "[redacted]")}
 => ["192.168.1.1", "x", "xx", "xxx"]
2.5.8 :008 > data
 => "[redacted]\n[redacted]1"
2.5.8 :009 >

Just simply trying to replace an exact match with gsub.

Upvotes: 1

Views: 153

Answers (2)

nullTerminator
nullTerminator

Reputation: 396

It is replacing the first match, just not the way you expect. The first pattern in your array should be '^192.168.1.1$' if you want it to match the entire string instead of just part of it.

Upvotes: 0

LewlSauce
LewlSauce

Reputation: 5882

So I realized that the answer was simply adding \b before and after the string, as follows:

replace_array.each {|s| data.gsub!(/\b#{s}\b/i, "[redacted]")}

Problem solved.

Reference: Ruby replace only exact matching string with another string

Upvotes: 1

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