Ruby String Match

Question

How do you do the reverse of

asd = 'qwe'

asd.match('qwe') do
  p 'it matches'
else
  p 'it doesnt match'
end

By reverse, I mean

asd.does_not_match('qwe') do
  p 'it doesnt match'
else
 p 'it matches'
end

What is the syntax for 'doesn't match'?

Does that even work? How are you doing an else without an if? — Dave Newton
– Dave Newton, Commented Jan 21, 2014 at 23:24
You definitely need to use an if statement to make this work properly in the first place --> add if before asd.match('qwe') and then remove do. — benjaminjosephw
– benjaminjosephw, Commented Jan 22, 2014 at 0:33

benjaminjosephw · Accepted Answer · 2014-01-21 23:38:44Z

7

To get the opposite effect of if you could use unless like this:

unless asd.match('qwe')
  puts 'it doesnt match'
else
  puts 'it matches'
end

or you could use if but with a "bang" (exclamation mark) at the beginning of the expression you wish to 'reverse' the boolean value of that expression.

if !asd.match('qwe')
  puts 'it doesnt match'
else
  puts 'it matches'
end

Have a read up on conditional statements in ruby to find out more.

answered Jan 21, 2014 at 23:38

benjaminjosephw

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1 Comment

user3163916 Over a year ago

Thanks, just what I needed! I understand about the conditional statement, just not sure how to implement that with match method. :D

Jaffa · Accepted Answer · 2014-03-25 10:53:52Z

4

result = asd.match('qwe') ? "it matches" :  "it doesn't match"

puts result

it matches

result = !asd.match('qwe') ? "it matches" :  "it doesn't match"

puts result

it doesn't match

Ternary operator will make your code simple, try it too...

edited Mar 25, 2014 at 10:53

Jaffa

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answered Jan 22, 2014 at 5:10

Mothirajha

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2 Comments

user3163916 Over a year ago

oh, does ternary operator support multiple line commands in ruby? I came from C/C++, and ternary basically only does 1 line command.

Mothirajha Over a year ago

Functionality of ternary operator does not change, it is same as C/C++.

SciPhi · Accepted Answer · 2014-01-21 23:44:43Z

1

Use the operator '!' to invert the logic of a statement. Just change the first line to

!(asd.does_not_match('qwe')) do

*I like to include parentheses around the whole statement just because it's cleaner to see what you're negating

edited Jan 21, 2014 at 23:44

SciPhi

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answered Jan 21, 2014 at 23:27

Seyon

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Comments

vooop · Accepted Answer · 2021-10-22 17:14:07Z

0

you could also do

unless asd.match('qwe') do
  puts "It matches."
else
  puts "It doesn't match."
end

answered Oct 22, 2021 at 17:14

vooop

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