[英]Regex only allow alphanumeric and at least two characters
我正在使用PHP，並且需要驗證的字符串必須是...
我有我認為僅適用於Az和0-9的正確正則表達式是...
if(preg_match('/[^a-z_\-0-9]/i', $string))
{
echo "not valid string";
}
但是我該如何添加以確保它至少兩個字符長？
我會看
^[a-zA-Z0-9]{2,}$
start string, any character in a-z or A-Z or 0-9, matched two or more times, end string.
正則表達式只允許大括號內的字母數字字符和下划線和特定占位符
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[英]PHP preg_match - only allow alphanumeric strings and - _ characters
正則表達式只允許使用字母數字，逗號，連字符，下划線和分號
[英]Regex to only allow alphanumeric, comma, hyphen, underscore and semicolon
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