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Top Forums Shell Programming and Scripting perl linux file name validation Post 302331361 by jimmy_y on Monday 6th of July 2009 02:37:21 AM
Old 07-06-2009
Quote:
Originally Posted by KevinADC
just escape the dash:

Code:
if ($a =~ s/[A-Za-z0-9_\-.]//g) {

you could write it like this too:

Code:
if ($a =~ s/[\w.-]//g) {

in which case the dash does not need to be escaped because its on the end and \w is the same as a-zA-Z0-9_

The dot never needs to be escaped in a character class no matter where it is positioned but a few characters do, like a dash.
Thanks Kevin,

But when i use:
#!/usr/bin/perl
$a = "a";
#if ($a =~ s/[A-Za-z0-9_-.]//g) {
if ($a =~ s/[A-Za-z0-9_\-.]//g) {
print "invalid file name\n";
} else {
print "valid file name\n";
}

i got
invalid file name

Smilie
 

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qmail-local(8)						      System Manager's Manual						    qmail-local(8)

NAME
qmail-local - deliver or forward a mail message SYNOPSIS
qmail-local [ -nN ] user homedir local dash ext domain sender defaultdelivery DESCRIPTION
qmail-local reads a mail message and delivers it to user by the procedure described in dot-qmail(5). The message's envelope recipient is local@domain. qmail-local records local@domain in a new Delivered-To header field. If exactly the same Delivered-To: local@domain already appears in the header, qmail-local bounces the message, to prevent mail forwarding loops. The message's envelope sender is sender. qmail-local records sender in a new Return-Path header field. homedir is the user's home directory. It must be an absolute directory name. dash and ext identify the .qmaildashext file used by qmail-local; see dot-qmail(5). Normally dash is either empty or a lone hyphen. If it is empty, qmail-local treats a nonexistent .qmailext the same way as an empty .qmailext: namely, following the delivery instructions in defaultdelivery. The standard input for qmail-local must be a seekable file, so that qmail-local can read it more than once. OPTIONS
-n Instead of reading and delivering the message, print a description of the delivery instructions. -N (Default.) Read and deliver the message. EXIT CODES
0 if the delivery is completely successful; nonzero if any delivery instruction failed. Exit code 111 indicates temporary failure. SEE ALSO
dot-qmail(5), envelopes(5), qmail-command(8), qmail-queue(8), qmail-send(8), qmail-lspawn(8) qmail-local(8)
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