[英]PHP Regular expression for maximum of two special characters in a string
I am validating a text field in PHP in which I allow letters, numbers, dots, dashes, and underscore. 我正在验证PHP中的文本字段,在其中允许字母,数字,点,破折号和下划线。 But I want a maximum of two dots and/or two dashes and/or two underscores.
但是我最多需要两个点和/或两个破折号和/或两个下划线。 How would I do that?
我该怎么做? And if that's not doable, then how would I allow maximum of two of any of the above?
如果这不可行,那么我如何允许上述任何两个中的最多两个?
I would do it this way. 我会这样做。
function checkString($string){
$c1 = substr_count($string, '.');
$c2 = substr_count($string, '-');
$c3 = substr_count($string, '_');
if($c1 <= 2 && $c2 <= 2 && $c3 <= 2){
return true;
}else{
return false;
}
}
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