正则表达式检查 ruby​​ 中的字母数字字符串 [英] Regex to check alphanumeric string in ruby

问题描述

我正在尝试验证 ruby​​ 中的字符串.任何包含空格、下划线或任何特殊字符的字符串都应无法通过验证.有效字符串应仅包含字符 a-zA-Z0-9我的代码看起来像.

I am trying to validate strings in ruby. Any string which contains spaces,under scores or any special char should fail validation. The valid string should contain only chars a-zA-Z0-9 My code looks like.

def validate(string)
    regex ="/[^a-zA-Z0-9]$/
    if(string =~ regex)
        return "true"
    else
        return "false"
end

我收到错误:类型错误:类型不匹配:给定字符串.

I am getting error: TypeError: type mismatch: String given.

谁能告诉我这样做的正确方法是什么?

Can anyone please let me know what is the correct way of doing this?

推荐答案

您可以只检查字符串中是否存在特殊字符.

You can just check if a special character is present in the string.

def validate str
 chars = ('a'..'z').to_a + ('A'..'Z').to_a + (0..9).to_a
 str.chars.detect {|ch| !chars.include?(ch)}.nil?
end

结果:

irb(main):005:0> validate "hello"
=> true
irb(main):006:0> validate "_90 "
=> false

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