How could I check to see if a word exists in a string, and return false if it doesn't, in ruby?

Like this: puts "yes" if str =~ /do:/i To return a boolean value (from a method, presumably), compare the result of the match to nil : def has_do(str) (str =~ /do:/i)! = nil end Or, if you don’t like the! = nil then you can use!

~ instead of ~ and negate the result: def has_do(str) not str! ~ /do:/i end But I don’t really like double negations ….

Like this: puts "yes" if str =~ /do:/i To return a boolean value (from a method, presumably), compare the result of the match to nil: def has_do(str) (str =~ /do:/i)! = nil end Or, if you don’t like the! = nil then you can use!

~ instead of =~ and negate the result: def has_do(str) not str! ~ /do:/i end But I don’t really like double negations ….

E.g. If str =~ /do: /i puts "yes" end – oxo Apr 4 at 13:18 @oxo Yes of course.In fact, the first code is merely a shorthand of that. – Konrad Rudolph Apr 4 at 13:49 There's also the good old!

Trick to only get a boolean result: >>!(str =~ /do:/i) #=> true and >>!(str =~ /da:/i) #=> false. – Michael Kohl Apr 4 at 14:40.

If all I'm looking for is a case=insensitive substring match I usually use: str. Downcase'do: ' 9 times out of 10 I don't care where in the string the match is, so this is nice and concise. Here's what it looks like in IRB: >> str = "Things to do: eat and sleep." #=> "Things to do: eat and sleep.

" >> str. Downcase'do: ' #=> "do: " >> str. Downcase'foobar' #=> nil Because it returns nil if there is no hit it works in conditionals too.

You could also do this: str.downcase. Include? "Some string".downcase.

Things to do: eat and sleep. ". Index(/do: /i) index returns the position where the match starts, or nil if not found You can learn more about index method here: ruby-doc.org/core/classes/String.html Or about regex here: regular-expressions.info/ruby.html.

In ruby 1.9 you can do like this: str.downcase. Match("do: ") do puts "yes" end It's not exactly what you asked for, but I noticed a comment to another answer. If you don't mind using regular expressions when matching the string, perhaps there is a way to skip the downcase part to get case insensitivity.

For more info, see String#match.

Str. Match(/do: /i) – the Tin Man Apr 4 at 14:07 @theTinMan Oh, and it was even in the first answer as well. Need to think better next time =) – Jakob W Apr 4 at 14:46.

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