Every developer needs to know how to work with strings in the language they are using. The Go libraries makes replacing parts of strings easy for a developer. I will show three solutions for replacing parts of a string in Go. Solution 1 The simple way is to use the function from the package. This function takes in four values: Replace strings : This is the reference string. s : This is the value in the string we want to change. old : This is the new string value. new string : This is the number of times to do the replacement. n If you use -1 it will replace all string values that are equal to the old value <a href="https://medium.com/media/43d9351ad089b4470f014a0ae8bd5466/href">https://medium.com/media/43d9351ad089b4470f014a0ae8bd5466/href</a> This is the output: Mary had a little Gopher Gopher duck If we change line 13 above to: out := strings.Replace(refString, "duck", "dog", -1) This is the output: Mary had a little Gopher Gopher Gopher Solution 2 When you have more than one string value to replace you should use the function from the packages. This function returns a . This method can be use to replace multiple string a once. NewReplacer strings new Replacer from a list of old, new string pairs <a href="https://medium.com/media/d6abfd854b89c827ad40411162c62836/href">https://medium.com/media/d6abfd854b89c827ad40411162c62836/href</a> This is the output: John had a little Gopher Gopher Solution 3 The more sophisticated way of replaces substring is to use regular expression or regex. For this solution, we will use the and from the package. MustCompile ReplaceAllString regexp : Creates our regular expression. In this case, it’s a string that starts with d and is followed by any characters between a and z. MustCompile : This will replace substring that matches the regular expression the string Gopher ReplaceAllStrings <a href="https://medium.com/media/e44a348cecd264aeebdd47a502bdb947/href">https://medium.com/media/e44a348cecd264aeebdd47a502bdb947/href</a> This would output: Mary had a little Gropher Gopher Originally published at harrisonbrock.com .
