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==Quantifier Syntaxes==



<source lang="html4strict">

Quantifier Min Max Range
{m} m m Exactly m times
{m, x} m x At least m times, no more than x
{m,} m Infinite At least m times or more
* 0 Infinite Zero or more times
? 0 1 Zero or one times
+ 1 Infinite One or more times

</source>

==Replace the tag content without getting rid of any attributes==



<source lang="html4strict">

<?php
$string = "<a href=\"http://www.wbex.ru/\">wbex.ru</a><br />" ;

$pattern = "/<a(.*?)>.*?<\/a>/i";
$replacement = "<a\1>Click!</a>";

$string = preg_replace($pattern, $replacement, $string);
print($string);
?>

</source>

==Replacing a Pattern with a Found String==



<source lang="html4strict">
<html>
<head>
<title>preg_replace</title>
</head>
<body>
<?php
$string = "<a href=\"http://www.wbex.ru/\">wbex</a><br />";

$pattern = "/<a[ .]*?(href *= *".*?").*?>(.*?)<\/a>/i";
$replacement = "\2: <a \1>\1</a>";

$string = preg_replace($pattern, $replacement, $string);
print($string);
?>
</body>
</html>

</source>

==String replace: index and value==



<source lang="html4strict">
<?
print(substr_replace("ABCDEFG", "-", 2, 3));
?>

</source>

==String replace with Regular Expressions==



<source lang="html4strict">

<?
$old_string = "I really love programming in ASP!";
$new_string = ereg_replace("ASP", "PHP", $old_string);
echo "$new_string";
?>

</source>

==str_replace: @ (at)==



<source lang="html4strict">
<?php
$author = "j@wbex.ru";
$author = str_replace("@","(at)",$author);
echo "Contact the author of this article at $author.";
?>

</source>

==What happens when multiple instances of the search string overlap?==



<source lang="html4strict">

<?
$tricky_string = "ABA is part of ABABA";
$maybe_tricked = str_replace("ABA", "DEF", $tricky_string);
print("Substitution result is "$maybe_tricked"<BR>");
?>

</source>

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в 10:37, 26 мая 2010

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