regexp: add simple package-level example
Update #4125
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6846045
diff --git a/src/pkg/regexp/example_test.go b/src/pkg/regexp/example_test.go
new file mode 100644
index 0000000..aa92e0b
--- /dev/null
+++ b/src/pkg/regexp/example_test.go
@@ -0,0 +1,22 @@
+package regexp_test
+
+import (
+ "fmt"
+ "regexp"
+)
+
+func Example() {
+ // Compile the expression once, usually at init time.
+ // Use raw strings to avoid having to quote the backslashes.
+ var validID = regexp.MustCompile(`^[a-z]+\[[0-9]+\]$`)
+
+ fmt.Println(validID.MatchString("adam[23]"))
+ fmt.Println(validID.MatchString("eve[7]"))
+ fmt.Println(validID.MatchString("Job[48]"))
+ fmt.Println(validID.MatchString("snakey"))
+ // Output:
+ // true
+ // true
+ // false
+ // false
+}
