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I have a string let's say http://someUrul.com/someController/SOmeAction?SomeQS=http://someOtherUrl
and I want to replace the first http with https, but not the second, so I end up with https://someUrul.com/someController/SOmeAction?SomeQS=http://someOtherUrl
How can I accomplish this with a simple gsub? The following replaces both.
request.url.gsub(/http:/, "https:") 
555
To replace a word in string, you do: sentence. gsub(/match/, "replacement") .
gsub! is a String class method in Ruby which is used to return a copy of the given string with all occurrences of pattern substituted for the second argument. If no substitutions were performed, then it will return nil. If no block and no replacement is given, an enumerator is returned instead.
The sub() and gsub() function in R is used for substitution as well as replacement operations. The sub() function will replace the first occurrence leaving the other as it is. On the other hand, the gsub() function will replace all the strings or values with the input strings.
The “sub” in “gsub” stands for “substitute”, and the “g” stands for “global”. Here is an example string: str = "white chocolate" Let's say that we want to replace the word “white” with the word “dark”. Here's how: str.gsub("white", "dark")
Use sub, not gsub. gsub is global, sub isn't.
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