php preg_replace删除字符串中的千位分隔符

Question

有一篇很长的文章,我只想删除thousand separator,而不是逗号.

$str = "Last month's income is 1,022 yuan, not too bad.";
//=>Last month's income is 1022 yuan, not too bad.

preg_replace('#(\d)\,(\d)#i','???',$str);

如何编写正则表达式模式？谢谢

Answer 1

如果简化的规则"匹配任何直接位于数字之间的逗号"对你来说已经足够了,那么

preg_replace('/(?<=\d),(?=\d)/','',$str);

应该做.

您可以通过确保正好三位数来改进它:

preg_replace('/(?<=\d),(?=\d{3}\b)/','',$str);