【转】 http://www.syyong.com/Go/Go-to-determine-whether-the-variable-is-a-legal-digital-algorithm.html
IsNumeric — 检测变量是否为数字或数字字符串。
支持小数点、十六进制(hex)、科学计数法。
is_numeric
// is_numeric()
func IsNumeric(val interface{}) bool {
switch val.(type) {
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
case float32, float64, complex64, complex128:
return true
case string:
str := val.(string)
if str == "" {
return false
}
// Trim any whitespace
str = strings.Trim(str, " \\t\\n\\r\\v\\f")
if str[] == '-' || str[] == '+' {
if len(str) == {
return false
}
str = str[:]
}
// hex
if len(str) > && str[] == '' && (str[] == 'x' || str[] == 'X') {
for _, h := range str[:] {
if !((h >= '' && h <= '') || (h >= 'a' && h <= 'f') || (h >= 'A' && h <= 'F')) {
return false
}
}
return true
}
// 0-9,Point,Scientific
p, s, l := , , len(str)
for i, v := range str {
if v == '.' { // Point
if p > || s > || i+ == l {
return false
}
p = i
} else if v == 'e' || v == 'E' { // Scientific
if i == || s > || i+ == l {
return false
}
s = i
} else if v < '' || v > '' {
return false
}
}
return true
} return false
}