CODEWITHSUNDEEP
ruby-on-railsruby
marcamillion
marcamillion

Reputation: 33755

How do I check to see if a string contains specific characters, and if it does replace just that bit?

I want to replace all strings that contain the characters c# which can include c#-4.0, c#-3.0, ms-c#, etc.

How do I check to see if c# exists within a string, and if it does, just replace the c# portion of that string?

i.e. for c#-4.0 the modified string would be c%23-4.0. It would be preferable if a native method of the Ruby core library is used (like one of String's methods).

I tried tagname.replace('c%23') but that replaces the entire string, and not just the substring that matches the pattern.

Thoughts?

Upvotes: 2

Views: 1276

Answers (2)

MrYoshiji
MrYoshiji

Reputation: 54882

You can use the gsub method of String. (Use sub if you want to replace only once in the string).

"hello".gsub(/[aeiou]/, '*')                  #=> "h*ll*"
"hello".gsub(/([aeiou])/, '<\1>')             #=> "h<e>ll<o>"
"hello".gsub(/./) {|s| s.ord.to_s + ' '}      #=> "104 101 108 108 111 "
"hello".gsub(/(?<foo>[aeiou])/, '{\k<foo>}')  #=> "h{e}ll{o}"
'hello'.gsub(/[eo]/, 'e' => 3, 'o' => '*')    #=> "h3ll*"

# in your case :
"some string c#".gsub!('c#', 'c%23')           #=> "some string c%23"

Upvotes: 2

Erez Rabih
Erez Rabih

Reputation: 15788

Use String gsub method:

"c#-4.0".gsub!(/c#/, "c%23")

Upvotes: 2

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