How to allow only numeric charaters using preg_replace in ruby and ruby on rails

Question

Am trying to allow and print only numeric characters. To this effect, I have reference solution found here which uses str.gsub("/some regex/", '') method but cannot get it to work. source here is the code

 mystring= 'Food1248is read 100'
    result = mystring.gsub("[^0-9]", '')

    print(result)

I need to only get the numbers from the string variable above

score 0 · Accepted Answer · answered Apr 15 '19 at 11:45

0

mystring= 'Food1248is read 100'    
mystring.gsub(/\D/, '')
=> "1248100"

answered Apr 15 '19 at 11:45

Umesh Malhotra

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Thanks Umesh. I never guess that. The regex [^0-9] works very well with my python flask and Django apps. you saved my time. – Nancy Moore Apr 15 '19 at 12:10

score 0 · Answer 2 · answered Apr 15 '19 at 12:10

0

mystring= 'Food1248is read 100'
p mystring.scan(/\d+/).join

output

"1248100"

answered Apr 15 '19 at 12:10

Rajagopalan

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score 0 · Answer 3 · answered Apr 15 '19 at 12:58

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mystring= 'Food1248is read 100'
mystring.gsub(/[a-zA-Z]/, '').delete(' ')

Output:

answered Apr 15 '19 at 12:58

Girish Bhanarkar

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score 0 · Answer 4 · answered Apr 15 '19 at 13:23

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In str.gsub("/some regex/", '') "/some regex/" is not a regex, it is a string. /some regex/ is a regex; just as /[^0-9]/ which would work.

answered Apr 15 '19 at 13:23

steenslag

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How to allow only numeric charaters using preg_replace in ruby and ruby on rails

4 Answers4