Rewrote test for 'FindString()' to use lookarounds

regex/example_test.go

@@ -32,12 +32,12 @@ func ExampleReg_FindAll() {
 }
 
 func ExampleReg_FindString() {
-	regexStr := `\d+`
+	regexStr := `\w+\s+(?=sheep)`
 	regexComp := regex.MustCompile(regexStr)
 
-	matchStr := regexComp.FindString("The year is 2025")
+	matchStr := regexComp.FindString("pink cows and yellow sheep")
 	fmt.Println(matchStr)
-	// Output: 2025
+	// Output: yellow
 }
 
 func ExampleReg_FindSubmatch() {