Any characters 6 to 16 are. {6, 16}
Only numbers, letters, and underscores are composed of [0-9_a-zA-Z]
Add the total to pepper ^ [_ 0-9a-z] {6, 16} $
| The code is as follows: |
Copy code |
<? Php
Function ispassword ($ str ){
If (preg_match ('/^ [_ 0-9a-z] {6, 16} $/I', $ str )){
Return true;
} Else {
Return false;
}
}
$ Password = 'abcde @';
If (ispassword ($ password )){
Echo 'conformances ';
} Else {
Echo 'nonconformity ';
}
// Output does not match Echo '<br> ';
$ Password = 'abcdeasdas _ 000000 ';
If (ispassword ($ password )){
Echo 'conformances ';
} Else {
Echo 'nonconformity ';
}
// Output
?> |
Example 2
| The code is as follows: |
Copy code |
$ Action = trim ($ _ get ['action']);
If ($ action = "sub ")
{
$ Str = $ _ post ['dir'];
// If (! Preg_match ("/^ [". chr (0xa1 ). "-". chr (0xff ). "A-Za-z0-9 _] + $/", $ str) // gb2312 regular expression of Chinese characters, letters, numbers, underscores (_)
If (! Preg_match ("/^ [x {4e00}-x {9fa5} A-Za-z0-9 _] + $/u", $ str) // regular expression of UTF-8 Chinese characters, letters, numbers, underscores (_)
{
Echo "<font color = red> the [". $ str. "] you entered contains illegal characters </font> ";
}
Else
{
Echo "<font color = green> the [". $ str. "] you entered is completely legal. Pass! </Font> ";
}
}
?>
<Form method = "post" action = "">
Input characters (numbers, letters, Chinese characters, and underlines ):
<Input type = "text" name = "dir" value = "">
<Input type = "submit" value = "submit">
</Form>
|
