Add regexp

regex/regex.go

@@ -0,0 +1,25 @@
+package regex
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+)
+
+var r = regexp.MustCompile("p([a-z]+)ch")
+var f = fmt.Println
+
+func Regex() {
+	matches, _ := regexp.MatchString("p([a-z]+)ch", "peach")
+	f("regexp.MatchString =>", matches)
+
+	f("r.MatchString() =>", r.MatchString("peach"))
+	f("r.FindString() =>", r.FindString("peach poach pouch"))
+	f("r.FindAllString() =>", r.FindAllString("peach poach pouch", -1))
+	f("r.FindStringIndex() =>", r.FindStringIndex("peach poach pouch"))
+	f("r.FindAllStringIndex() =>", r.FindAllStringIndex("peach poach pouch", -1))
+	f("r.FindStringSubmatch() =>", r.FindStringSubmatch("peach poach pouch"))
+	f("r.FindAllStringSubmatch() =>", r.FindAllStringSubmatch("peach poach pouch", -1))
+	f("r.ReplaceAllString() =>", r.ReplaceAllString("peach poach pouch", "<fruit>"))
+	f("r.ReplaceAllStringFunc() =>", r.ReplaceAllStringFunc("peachy peter poached a pouch", func(sub string) string { return strings.ToUpper(sub) }))
+}