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Word metacharacter "\w" in Regular Expression
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Tutorials
Regular-expression
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Topic |
How is word metacharacter "\w" used in regex?
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Explanation |
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The "\w" metacharacter is used to match any word character including underscore "_" in regular expression.The word
character's are "[a-z][A-Z][0-9]".
PHP Example:
<?php
$emp = "&\na\r\t";
if (preg_match("/\w/", $emp, $matches))
{echo "Pattern matches!";
print "<br>";
echo $matches[0];}
else
{echo "Pattern not matched!";}
?>
Result:
Pattern matches!
a
In the above example of regex, "a" is the only word character, so its matched.
Perl Example:
#! C:\programfiles\perl\bin\perl
print "content-type: text/html\n\n";
$name= "\n*\r>\f";
if ($name =~ m/w/)
{print "It's matched!";}
else
{print "It's not matched!";}
Result:
It's not matched!
In the above example for word metacharacter in regex, the pattern "/\w/" is unmatched as the string does not have
any word characters.
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| A Note |
Simple Regex Regular Expression Tutorial Online. We welcome your Valuable feedbacks or suggestions. This is a copyright content.
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