问题

I have tried several regex found on SO and as google resulted.

我尝试了在SO和Google上找到的多个正则表达式。

I am trying to use regex as validating rule in adonis js as

我正在尝试在adonis js 中将regex 用作验证规则，如下：

first_name: 'required|regex:[a-zA-z]+([\s][a-zA-Z]+)*$'

我的目标是实现这一点；
只接受单词之间的单个空格，

regex which accepts only single space between words,

正则表达式只接受单词之间的单个空格，

John Doe - True //(single space between words and no space before and after)
John Doe - True //(single space between and one space before)
John doe - true //(single space between and one space after)
jhon doe - false //(two spaces between words. )
John3 Doe - false
3John Doe - False

John Doe - True //(单词之间有单个空格，前后都没有空格)
John Doe - True //(单词之间有一个空格，前面有一个空格)
John doe - true //(单词之间有一个空格，后面有一个空格)
jhon doe - false //(单词之间有两个空格。)
John3 Doe - false
3John Doe - False

I have tried several regex which works on online regex checkers but does not responds properly in adonis

我尝试了在在线正则表达式检查器上有效的多个正则表达式，但在adonis中没有正确响应

here in one https://regex101.com/r/pN8xL5/312

在这里 https://regex101.com/r/pN8xL5/312 有一个例子。

first_name: 'required|regex:[a-zA-z]+([\s][a-zA-Z]+)*$'

John Doe - True //(single space between words and no space before and after)
 John Doe - True //(single space between and one space before)
John doe  - true //(single space between and one space after)
jhon  doe - false //(two spaces between words. )
John3 Doe  -  false
3John Doe  - False

答案1

得分: 2

I don't know Adonis, but it looks like it tried to match the whole string.

Using regex101 web site, I came up with the following regex, with g and m options:

^ *([a-zA-Z]+) ([a-zA-Z]+) *

It matches:

• ^ - start of row,
• * - an initial sequence of spaces (if any),
• ([a-zA-Z]+) - a non-empty sequence of letters (the first capturing group),
• - a space
• ([a-zA-Z]+) - another non-empty sequence of letters (the second capturing group),
• * - a trailing sequence of spaces (if any).

In regex101 it matches first 3 input rows from your sample, just as you want.

As I suppose, your regex should check only a single string,
so in the final version of regex:

• remove leading ^ and trailing $,
• remove regex options,

so your regex to be used in Adonis should be:

 *([a-zA-Z]+) ([a-zA-Z]+) *

^ *([a-zA-Z]+) ([a-zA-Z]+) *$

 *([a-zA-Z]+) ([a-zA-Z]+) *

答案2

得分: -1

请查看这个答案：forum.adonisjs.com/t/rule-not-accepting-regex/

你需要使用 rule() 来处理正则表达式。类似这样：

const { validate, rule } = use("Validator");

const rules = {
      first_name: [
        rule(
          "required"
        ),
        rule(
          "regex",
          [a-zA-z]+([\s][a-zA-Z]+)*$
        ),
        ...
      ]
    };

const { validate, rule } = use("Validator");

const rules = {
      first_name: [
        rule(
          "required"
        ),
        rule(
          "regex",
          [a-zA-z]+([\s][a-zA-Z]+)*$
        ),
        ...
      ]
    };