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I want to see if a string has any white space in it. What's the most effective way of doing this in ruby?
Thanks
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If you are using Rails, you can simply use: x. blank? This is safe to call when x is nil, and returns true if x is nil or all whitespace.
For checking if a string contains whitespace use a Matcher and call its find method. Show activity on this post. Character. isWhitespace(char)
Whitespace characters such as spaces and tabs are generally ignored in Ruby code, except when they appear in strings. Sometimes, however, they are used to interpret ambiguous statements. Interpretations of this sort produce warnings when the -w option is enabled.
If by "white space" you mean in the Regular Expression sense, which is any of space character, tab, newline, carriage return or (I think) form-feed, then any of the answers provided will work:
s.match(/\s/) s.index(/\s/) s =~ /\s/ or even (not previously mentioned)
s[/\s/] If you're only interested in checking for a space character, then try your preference of
s.match(" ") s.index(" ") s =~ / / s[" "] From irb (Ruby 1.8.6):
s = "a b" puts s.match(/\s/) ? "yes" : "no" #-> yes puts s.index(/\s/) ? "yes" : "no" #-> yes puts s =~ /\s/ ? "yes" : "no" #-> yes puts s[/\s/] ? "yes" : "no" #-> yes s = "abc" puts s.match(/\s/) ? "yes" : "no" #-> no puts s.index(/\s/) ? "yes" : "no" #-> no puts s =~ /\s/ ? "yes" : "no" #-> no puts s[/\s/] ? "yes" : "no" #-> no If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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