How to use [[:lower:]] Character Class.
What is [[:lower:]] Character Class?
Explanation
The "[[:lower:]]" represent's lower case alphabets that is from [a-z].
<?php
$str = "AAAAbbbbCCCC";
$pat = ereg_replace("[[:lower:]]","B",$str);
echo $pat;
echo "n<br>n";
?> Result :
AAAABBBBCCCC
In the above example the character class "[[:lower:]]", is used in the "ereg_replace" command to replace the string "AAAAbbbbCCCC" having lower case "b's" with an upper case "B".
#! C:programfilesperlbinperl
print "content-type: text/htmlnn";
$str = "dsADSDSDs";
if ( $str =~ /[[:lower:]]{2,3}/)
{print "Matches!";}
else
{print "Unmatch!";} Result :
Matches!
In the above example the string is checked using the pattern [[:lower:]] to have 2 to 3 given in braces "{2,3}" lowercase characters, so its matched as the string has 3 lowercase letters.
PHP Example:
<?php
$str = "AAAAbbbbCCCC";
$pat = ereg_replace("[[:lower:]]","B",$str);
echo $pat;
echo "n<br>n";
?>
AAAABBBBCCCC
In the above example the character class "[[:lower:]]", is used in the "ereg_replace" command to replace the string "AAAAbbbbCCCC" having lower case "b's" with an upper case "B".
Perl Example:
#! C:programfilesperlbinperl
print "content-type: text/htmlnn";
$str = "dsADSDSDs";
if ( $str =~ /[[:lower:]]{2,3}/)
{print "Matches!";}
else
{print "Unmatch!";}
Matches!
In the above example the string is checked using the pattern [[:lower:]] to have 2 to 3 given in braces "{2,3}" lowercase characters, so its matched as the string has 3 lowercase letters.
