@@ -7,6 +7,15 @@ import (

 	"strings"

 )

+var sizeRegex *regexp.Regexp

+

+func init() {

+	var err error

+	if sizeRegex, err = regexp.Compile("^(\\d+)([kKmMgGtTpP])?[bB]?$"); err != nil {

+		panic("Failed to compile the 'size' regular expression")

+	}

+}

+

 // HumanSize returns a human-readable approximation of a size

 // using SI standard (eg. "44kB", "17MB")

 func HumanSize(size int64) string {

@@ -24,12 +33,7 @@ func HumanSize(size int64) string {

 // FromHumanSize returns an integer from a human-readable specification of a size

 // using SI standard (eg. "44kB", "17MB")

 func FromHumanSize(size string) (int64, error) {

-	re, err := regexp.Compile("^(\\d+)([kKmMgGtTpP])?[bB]?$")

-	if err != nil {

-		return -1, fmt.Errorf("%s does not specify not a size", size)

-	}

-

-	matches := re.FindStringSubmatch(size)

+	matches := sizeRegex.FindStringSubmatch(size)

 	if len(matches) != 3 {

 		return -1, fmt.Errorf("Invalid size: '%s'", size)

@@ -63,12 +67,7 @@ func FromHumanSize(size string) (int64, error) {

 // returns the number of bytes, or -1 if the string is unparseable.

 // Units are case-insensitive, and the 'b' suffix is optional.

 func RAMInBytes(size string) (int64, error) {

-	re, err := regexp.Compile("^(\\d+)([kKmMgGtTpP])?[bB]?$")

-	if err != nil {

-		return -1, err

-	}

-

-	matches := re.FindStringSubmatch(size)

+	matches := sizeRegex.FindStringSubmatch(size)

 	if len(matches) != 3 {

 		return -1, fmt.Errorf("Invalid size: '%s'", size)