正则表达式只允许整数和逗号在字符串中 [英] Regular expression to only allow whole numbers and commas in a string

问题描述

有人知道只允许整数和逗号的字符串的preg_replace是什么吗?我要去除所有空格，字母，符号等，因此剩下的就是数字和逗号，但字符串中没有任何前导或训练逗号. (例如:5、7、12)

Does anyone know what the preg_replace would be for a string to only allow whole numbers and commas? I want to strip all whitespace, letters, symbols, etc, so all that is left is numbers and commas, but without any leading or training commas in the string. (Example: 5,7,12)

这是我现在使用的内容，我认为它只在逗号前后去除空格，但允许其他任何内容.

Here is what I am using now and it only strips whitespace before and after the commas but allows anything else, I think.

$str = trim(preg_replace('|\\s*(?:' . preg_quote($delimiter) . ')\\s*|', $delimiter, $str));

推荐答案

这应该可以满足您的需求:

This should do what you need:

$str = preg_replace(
  array(
    '/[^\d,]/',    // Matches anything that's not a comma or number.
    '/(?<=,),+/',  // Matches consecutive commas.
    '/^,+/',       // Matches leading commas.
    '/,+$/'        // Matches trailing commas.
  ),
  '',              // Remove all matched substrings.
  $str
);

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