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[英]Regex that will only allow alphanumeric characters and underscore and specific placeholder inside curly braces
[英]Regex only allow alphanumeric and at least two characters
我正在使用PHP,并且需要验证的字符串必须是...
我有我认为仅适用于Az和0-9的正确正则表达式是...
if(preg_match('/[^a-z_\-0-9]/i', $string))
{
echo "not valid string";
}
但是我该如何添加以确保它至少两个字符长?
我会看
^[a-zA-Z0-9]{2,}$
start string, any character in a-z or A-Z or 0-9, matched two or more times, end string.
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