.net in the regular expression should be introduced System.Text.RegularExpressions namespace
In this space there Regex class, write regular expressions instantiate the class
Regex regex = new Regex ( "regular expressions");
if (regex.IsMatch ( "To verify that the character string")) {
sucess!
}else{
error!
}
Common regular expression:
Pure numbers: ^ [0-9] * $
Pure letters: ^ [az, AZ] * $
email: ^ [a-zA-Z0-9 _.-] + @ [a-zA-Z0-9 -] + \. [a-zA-Z0-9 .-] + $
ID: ^ \\ d {15} | \\ d {} 18 $
Reproduced in: https: //www.cnblogs.com/maomaoBlog/archive/2010/03/10/1682261.html