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How to accept the \ "backslash" with the preg_match

Posted on 2006-11-16
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Medium Priority
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Last Modified: 2013-12-13

Hello, I'm having a problem with accepting the \ for my session.
Please show me how to accept the \ with preg_match function.



if (!isset($_SESSION)) session_start();
$_SESSION['Test']="sds \'";
if(!preg_match("/^[a-zA-Z0-9 \-\ ]{1,45}$/", stripslashes($_SESSION['Test'])) == 1){
echo "error<br>";
echo $_SESSION['Test'];
}
0
Comment
Question by:MaxDisk
  • 2
  • 2
5 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 17963158
this should do:
if(!preg_match("/^[a-zA-Z0-9 \-\ \\]{1,45}$/", stripslashes($_SESSION['Test'])) == 1){
0
 
LVL 13

Expert Comment

by:rhickmott
ID: 17965610
If you want to use \ in a regular expression without it taking it literally or escaping the next character you need to escape the \ with a \ so \\ :)
0
 

Author Comment

by:MaxDisk
ID: 17970413
I tried the \\ already but  found an error.

Warning: preg_match() [function.preg-match]: Compilation failed: missing terminating ] for character class at offset 25 in

<?
if (!isset($_SESSION)) session_start();
$_SESSION['Test']="sds \'";
if(!preg_match("/^[a-zA-Z0-9 \-\ \\]{1,45}$/", stripslashes($_SESSION['Test'])) == 1){
echo "error<br>";
echo $_SESSION['Test'];
}
?>
0
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 900 total points
ID: 17970714
can you tell us what you meant to "match" with the last part of your expression:
" \-\ "

what about this:

<?
if (!isset($_SESSION)) session_start();
$_SESSION['Test']="sds \'";
if(!preg_match("/^[a-zA-Z0-9 \\\-]{1,45}$/", stripslashes($_SESSION['Test'])) == 1){
echo "error<br>";
echo $_SESSION['Test'];
}
?>
0
 

Author Comment

by:MaxDisk
ID: 17976451

Sorry abou the confusing message.
What I really want is allow user to enter the backlash in the input field, but the problem is I don't know how to allow the preg_match to EXCLUDE the \.

But you solved my problem already

//Final piece
<?
if (!isset($_SESSION)) session_start();
$_SESSION['Test']="sds \ ";

if(!preg_match("/^[ \\ a-zA-Z0-9]{1,45}$/", stripslashes($_SESSION['Test'])) == 1){
echo "error<br>";
echo $_SESSION['Test'];
}
else
{
echo "Input accepted <br>";
echo $_SESSION['Test'];
}

?>
0

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