Given that Go strings are unicode, is there a way to safely determine whether a character (such as the first letter in a string) is a letter or a number? In the past I would just check against ASCII character ranges, but I doubt that would be very reliable with unicode strings.
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- douduan5753 2014-01-03 14:29关注
You can always use
func IsNumber(r rune) bool
in theunicode
package:if unicode.IsNumber(rune) { ... }
Just be aware that this includes more characters than just 0-9, such as roman numbers (eg. Ⅲ) or fractions (eg. ⅒) . If you specifically only want to check 0-9, you should instead do like you've done in the past (yes, it is UTF-8 safe):
if rune >= 48 && rune <= 57 { ... }
or
if rune >= '0' && rune <= '9' { ... } // as suggested by Martin Gallagher
For letters, the unicode package has a similar function: func IsLetter(r rune) bool
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