用于数字,逗号,下划线,斜杠,连字符和空格的PHP正则表达式

用于数字,逗号,下划线,斜杠,连字符和空格的PHP正则表达式

问题描述:

I need a string which consists of some numbers, comma, undersocre, slash, hyphen and space.

I am almost ok. Here is my code so far.

$regex = '#^[0-9-_,/\s]+$#';
if(preg_match($regex, $string)){
    return true;
} else {
    return false;
}

But I want to contain at least 4 digit within 0 to 9.

for example, These are the values I want to valid:

09-12345678
123, 456, 789
12/ 34/ 56

These are the values I don't want to valid:

1,2
3/5/6
7-8-9

So, I tried like this.

$regex = '#^[0-9-_,/\s]{4,100}$#';

And,

$regex = '#^[0-9{4,100}-_,/\s]+$#';

But they are not true too. How can I do?

我需要一个由一些数字,逗号,下划线,斜线,连字符和空格组成的字符串。 p>

我几乎可以。 到目前为止,这是我的代码。 p>

  $ regex ='#^ [0-9 -_,/ \ s] + $#'; 
if(preg_match($ regex)  ,$ string)){
 return true; 
} else {
 return false; 
} 
  code>  pre> 
 
 

但我想包含至少4位数 在0到9之内。 p>

例如, 这些是我想要有效的值: p>

  09-12345678 
123,456  ,789 
12 / 34/56 
  code>  pre> 
 
 

这些是我不想要有效的值: p>

  1,2 
3 / 5/6 
7-8-9 
  code>  pre> 
 
 

所以,我试过这样的。 p>

  $ regex ='#^ [0-9 -_,/ \ s] {4,100} $#'; 
  code>  pre> 
 
 

并且, p >

  $ regex ='#^ [0-9 {4,100} -_,/ \ s] + $#'; 
  code>  pre> 
 
  

但它们也不是真的。 我该怎么办? p> div>

You can use a lookahead based regex:

~^(?=(?:\D*\d){4})[-0-9_,/\s]+$~

RegEx Demo

  • (?=(?:\D*\d){4}) is lookahead to assert presence of at least 4 digits in input.
  • Also important is to keep hyphen at start or end in character class [...]