检查一个字符是字母还是数字？

Question

C 的 isalpha、isdigit 和 isalnum 的 Rust 等价物是什么？

Answer 1

is_alphabetic, is_digit, is_alphanumeric, is_numeric 就是您要找的。

例如:

fn main() {
    println!("1 is a digit {}", '1'.is_digit(10));
    println!("f is a hex digit {}", 'f'.is_digit(16));
    println!("a is alphabetic {}", 'a'.is_alphabetic());
    println!("こis alphabetic {}", 'こ'.is_alphabetic());
    println!("a is alphanumeric {}", 'a'.is_alphanumeric());
    println!("1 is alphanumeric {}", '1'.is_alphanumeric());
}

returns:

1 is a digit true
f is a hex digit true
a is alphabetic true
こis alphabetic true
a is alphanumeric true
1 is alphanumeric true

它们在 Rust standard library docs for chars 中有详细描述。

检查一个字符是字母还是数字？

Check whether a char is a letter or a number?

rust