How can I remove the string "\n" from within a Ruby string?
RubyRegexRuby Problem Overview
I have this string:
"some text\nandsomemore"
I need to remove the "\n" from it. I've tried
"some text\nandsomemore".gsub('\n','')
but it doesn't work. How do I do it? Thanks for reading.
Ruby Solutions
Solution 1 - Ruby
You need to use "\n"
not '\n'
in your gsub. The different quote marks behave differently.
Double quotes "
allow character expansion and expression interpolation ie. they let you use escaped control chars like \n
to represent their true value, in this case, newline, and allow the use of #{expression}
so you can weave variables and, well, pretty much any ruby expression you like into the text.
While on the other hand, single quotes '
treat the string literally, so there's no expansion, replacement, interpolation or what have you.
In this particular case, it's better to use either the .delete
or .tr
String method to delete the newlines.
Solution 2 - Ruby
If you want or don't mind having all the leading and trailing whitespace from your string removed you can use the strip
method.
" hello ".strip #=> "hello"
"\tgoodbye\r\n".strip #=> "goodbye"
as mentioned here.
edit The original title for this question was different. My answer is for the original question.
Solution 3 - Ruby
When you want to remove a string, rather than replace it you can use String#delete
(or its mutator equivalent String#delete!
), e.g.:
x = "foo\nfoo"
x.delete!("\n")
x
now equals "foofoo"
In this specific case String#delete
is more readable than gsub
since you are not actually replacing the string with anything.
Solution 4 - Ruby
You don't need a regex for this. Use tr:
"some text\nandsomemore".tr("\n","")
Solution 5 - Ruby
use chomp
or strip
functions from Ruby:
"abcd\n".chomp => "abcd"
"abcd\n".strip => "abcd"