Updated

Author: denevell

golang-regex-replace-split.md

@@ -0,0 +1,25 @@
+title: Golang regex: Replace and split
+tags: golang,golang-regex
+
+You can use the ReplaceAllString methods to replace a string, and manipulate groups if needed.
+
+        rp := regexp.MustCompile("([a-z]+) ([a-z]+)")
+        rp.ReplaceAllString("abc def ghi", "$2 $1") // "def abc ghi"
+
+$1 relates to the first group match, and $2 the same. You could just enter text to replace the entireity of the "abc def" string. 
+
+ReplaceAllLiteralString allows you to interpret the dollar sign literally.
+
+You can also use a function to do the replacement. You cannot use a groups here, however, as of 1.1.1 anyway.
+
+        rp.ReplaceAllStringFunc("abc def", func(s string) string {
+                if(s=="abc") {
+                        return "HA"
+                } 
+                return s        
+        }) // "HA def"
+
+You can split a string using the Split method. The second integer argument is the number of splits to perform. -1 means as many as possible.
+
+        rp = regexp.MustCompile("a")
+        i := rp2.Split("zzzzazzzzz", -1) // ["zzzz", "zzzz"]