Regular Expression Meta-character Whitespace "s"
What is regular expression meta-character Whitespace "s"?
Explanation
In Regular Expression, the meta-character "s" is used to match any whitespace like space, tab, form feed etc.
<?php
$emp = "empno is";
if (preg_match("/D{5}+s{1}+D{2}/", $emp))
echo "Regex Pattern matches!";
else
echo "Regex Pattern not matched!";
?> Result :
Pattern matches!
In the above example the pattern "/D{5}+s{1}+D{2}/", first matches for "5" non-digit characters, followed by "1" space then by "2" non-digit characters.
#! C:programfilesperlbinperl
print "content-type: text/htmlnn";
$name= "EMP.NOIS 123";
if ($name =~ m/s{2,3}/)
{print "It's matched!";}
else
{print "It's not matched!";} Result :
It's not matched!
In the above example the pattern "s{2,3}/" looks to match atleast "2" spaces upto "3" or more spaces, since the string has only "1" space it is matched.
PHP Example:
<?php
$emp = "empno is";
if (preg_match("/D{5}+s{1}+D{2}/", $emp))
echo "Regex Pattern matches!";
else
echo "Regex Pattern not matched!";
?>
Pattern matches!
In the above example the pattern "/D{5}+s{1}+D{2}/", first matches for "5" non-digit characters, followed by "1" space then by "2" non-digit characters.
Perl Example:
#! C:programfilesperlbinperl
print "content-type: text/htmlnn";
$name= "EMP.NOIS 123";
if ($name =~ m/s{2,3}/)
{print "It's matched!";}
else
{print "It's not matched!";}
It's not matched!
In the above example the pattern "s{2,3}/" looks to match atleast "2" spaces upto "3" or more spaces, since the string has only "1" space it is matched.
