import transaction from wechat pay billing file

pkg/utils/numbers.go

@@ -3,9 +3,14 @@ package utils
 import (
 	"crypto/rand"
 	"math/big"
+	"regexp"
 	"strings"
 )
 
+var (
+	numberPattern = regexp.MustCompile("(-?\\d+)(\\.\\d+)?")
+)
+
 // GetRandomInteger returns a random number, the max parameter represents upper limit
 func GetRandomInteger(max int) (int, error) {
 	result, err := rand.Int(rand.Reader, big.NewInt(int64(max)))
@@ -17,6 +22,17 @@ func GetRandomInteger(max int) (int, error) {
 	return int(result.Int64()), nil
 }
 
+// ParseFirstConsecutiveNumber returns the first consecutive number in the specified string
+func ParseFirstConsecutiveNumber(str string) (string, bool) {
+	result := numberPattern.FindAllString(str, 1)
+
+	if len(result) > 0 {
+		return result[0], true
+	} else {
+		return "", false
+	}
+}
+
 // TrimTrailingZerosInDecimal returns a textual number without trailing zeros in decimal
 func TrimTrailingZerosInDecimal(num string) string {
 	if len(num) < 1 {