xdigit Character Class
What is the use of [[:xdigit:]]?
Explanation
This character class helps in finding hexadecimal digit character.
<?php
$chr = 'WAB10BC99GZ';
$dgt = ereg_replace("[[:xdigit:]]","#", $chr);
echo $dgt;
?> Result :
W########GZ
In the above example, the regular expression matches given with hexadecimal digit character. Since the string is matched, it displays "all are hex chars".
#! C:programfilesperlbinperl
print "content-type: text/htmlnn";
$str = "GG";
if ($str =~ m/[[:xdigit:]]/)
{print "Matches!";}
else
{print "Unmatch!";} Result :
UnMatch!
In the above example we matched a string given as "GG", using the same pattern.
PHP Example:
<?php
$chr = 'WAB10BC99GZ';
$dgt = ereg_replace("[[:xdigit:]]","#", $chr);
echo $dgt;
?>
W########GZ
In the above example, the regular expression matches given with hexadecimal digit character. Since the string is matched, it displays "all are hex chars".
Perl Example:
#! C:programfilesperlbinperl
print "content-type: text/htmlnn";
$str = "GG";
if ($str =~ m/[[:xdigit:]]/)
{print "Matches!";}
else
{print "Unmatch!";}
UnMatch!
In the above example we matched a string given as "GG", using the same pattern.
