String replacement in ruby on rails

Question

I have a text like

details = "1. Command id = 22 Time = 2:30 <br> 2. Command id = 23 Time = 3:30"

Now I need to convert it into

"1. http://localhost:3000/command_id=22/home Time = 2:30 <br> 2. http://localhost:3000/command_id=23/home Time = 3:30"

I used regex and gsub but it will not do that as gsub will replace same string. Then there are some techniques using sed and awk.

To extract all ids like 22, 23, I used

details.scan(/Command id = [0-9]+/).join(",").scan(/[0-9]+/)

Any ideas how to do the above conversion?

What are you actually trying to achieve? Removing Command id = from the string or extracting the ids or both? — Stefan
– Stefan, Commented Oct 6, 2015 at 7:47

Deepak Mahakale · Accepted Answer · 2015-10-06 09:00:40Z

2

Why dont you just use

details.gsub(' Command id =', '')

It generates expected result

"1. 22 Time = 2:30 <br> 2. 23 Time = 3:30"

EDIT:

details.gsub('Command id = ', 'http://localhost:8000/')

It will generate

 "1. http://localhost:8000/22 Time = 2:30 <br> 2. http://localhost:8000/23 Time = 3:30"

edited Oct 6, 2015 at 9:00

answered Oct 6, 2015 at 8:46

Deepak Mahakale

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1 Comment

Tanish Gupta Over a year ago

I have edited my post.Can you please have a look into it.I want to generate http link .

Joe · Accepted Answer · 2015-10-08 05:48:25Z

2

Simple regex

details.gsub(' Command id =', '')

#=> "1. 22 Time = 2:30 <br> 2. 23 Time = 3:30"

answered Oct 8, 2015 at 5:48

Joe

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Joe · Accepted Answer · 2015-10-08 05:52:57Z

2

string.gsub('Command id =', '')

answered Oct 8, 2015 at 5:52

Joe

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Avinash Raj · Accepted Answer · 2015-10-06 07:41:36Z

1

Just replace Command id = with an empty string

string.gsub(/\s*\bCommand\s+id\s+=/, "")

answered Oct 6, 2015 at 7:41

Avinash Raj

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1 Comment

Stefan Over a year ago

You could just provide a string pattern, i.e. gsub('Command id = ', '')

Kalanidhi · Accepted Answer · 2015-10-06 09:14:10Z

0

Try this pure regex and get your expected output

sed 's/[^"]\+\([^ ]\+\)[^=]\+=\([^\.]\+.\)[^=]\+.\(.*\)/\1\2\3/' FileName

or

sed 's/Command id =\|details = //g' FileName

Output :

"1. 22 Time = 2:30 <br> 2. 23 Time = 3:30"

edited Oct 6, 2015 at 9:14

answered Oct 6, 2015 at 9:08

Kalanidhi

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Comments

Julli · Accepted Answer · 2015-10-06 09:49:32Z

0

def parse_to_words(line)line.split ' '
end

line = "1. Command id = 22 Time = 2:30 <br> 2. Command id = 23 Time = 3:30"

words = parse_to_words line

output= words[0] +  
        " http://localhost:3000/command_id=" + 
        words[4] +
        "/home Time = " +
        words[7] + 
        " <br> " + 
        words[9] +
        " http://localhost:3000/command_id=" +
        words[13] + 
        "/home Time = " +
        words[16]

Output: 1. http://localhost:3000/command_id=22/home Time = 2:30 <br> 2. http://localhost:3000/command_id=23/home Time = 3:30

Can of course be automated further

answered Oct 6, 2015 at 9:49

Julli

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