в 10:37, 26 мая 2010

2010-05-26T10:37:30Z

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2010-05-26T07:07:31Z

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==$0 is set to the whole match, then $1, $2==



<source lang="html4strict">

<?
$match = "/the (car|cat) sat on the (drive|mat)/";
$input = "the cat sat on the mat";
print preg_replace($match, "Matched $0, $1, and $2\n", $input);
?>

</source>

==Converting Line Breaks==



<source lang="html4strict">

<?php
function line_break_set($subject, $type) {
switch ($type) {
case "mac":
$ending = "\r";
break;
case "pc":
$ending = "\r\n";
break;
default:
$ending = "\n";
}
return preg_replace("/\r\n|\n\r|\n|\r/", $ending, $subject);
}
$str = "Multiple\rtypes of\n\rline breaks\r\nhave been placed
within this string\n\nSee?";
$mac = line_break_set($str, "mac");
$unix = line_break_set($str, "unix");
$pc = line_break_set($str, "pc");
echo "<pre>mac = ", addcslashes($mac, "\n\r"), "\npc = ",
addcslashes($pc, "\n\r"), "\nunix = ",
addcslashes($unix, "\n\r"), "</pre>";
?>

</source>

==e modifier treats the replacement string in preg_replace() as if it were PHP.==



<source lang="html4strict">

<?
function convDate( $month, $day, $year ) {
$year = ($year < 70 )?$year+2000:$year;
$time = ( mktime( 0,0,0,$month,$day,$year) );
return date("l d F Y", $time);
}
$dates = "3/18/03 \n7/22/04";
$dates = preg_replace( "/([0-9]+)\/([0-9]+)\/([0-9]+)/e","convDate($1,$2,$3)", $dates);
print $dates;
?>

</source>

==Entity encoding matched text==



<source lang="html4strict">

<?php
$html = "The tag makes text bold: <code>bold</code>";
print preg_replace("@<code>(.*?)</code>@e","html_entity_decode("$1")", $html);
?>

</source>

==Escape a > character in HTML==



<source lang="html4strict">

<?php
$html = " replace > and >> and >>> ";
print "Original text was: "" . $html . ""\n";
$html = strrev( $html );
$newhtml = preg_replace( "/>(?![^><]+?\/?<)/", ";tl&", $html );
$newhtml = strrev( $newhtml );
print "New text is: "" . $newhtml . ""\n";
?>

</source>

==Escaping Special Characters==



<source lang="html4strict">

<?php
$html = " replace > and >> and >>> ";
print "Original text was: "" . $html . ""\n";
$html = strrev( $html );
$newhtml = preg_replace( "/>(?![^><]+?\/?<)/", ";tl&", $html );
$newhtml = strrev( $newhtml );
print "New text is: "" . $newhtml . ""\n";
?>

</source>

==Formatting a Phone Number==



<source lang="html4strict">

<?php
$regex = "/^($?\d{3}$?)?[- .]?(\d{3})[- .]?(\d{4})$/";

$values = array("1235551234","800.555.1234", "123-555-1234" );
foreach ($values as $value) {
$formattedValue = preg_replace($regex, "(\\1) \\2-\\3", $value);
echo $formattedValue . "\n";
}
?>

</source>

==Pass a fourth parameter to preg_replace( ) to specify the maximum number of replacements you want to make.==



<source lang="html4strict">

<?
$a = "Foo moo boo tool foo";
$b = preg_replace("/[A-Za-z]oo\b/e", "strtoupper("$0")", $a, 2);
print $b;
?>

</source>

==pass arrays as parameter one and parameter two, and preg_replace() performs multiple replaces==



<source lang="html4strict">

<?
$a = "Foo moo boo tool foo";
$b = preg_replace("/[A-Za-z]oo\b/e", "strtoupper("$0")", $a);
print $b;
?>

</source>

==Pass arrays of regular expressions and replacement strings to preg_replace().==



<source lang="html4strict">

<?
$text = "25/12/2009, 14/5/0210. Copyright 2003";
$regs = array( "|\b(\d+)/(\d+)/(\d+)\b|", "/([Cc]opyright) 2003/" );
$reps = array( "$2/$1/$3", "$1 2004" );
$text = preg_replace( $regs, $reps, $text );
print "$text ";
?>

</source>

==preg_replace==



<source lang="html4strict">

<?php
$text = "This is a link to http://www.wbex.ru/.";
echo preg_replace("/http:\/\/(.*)\//", "<a href=\"\${0}\">\${0}</a>", $text);
?>

</source>

==preg_replace with index==



<source lang="html4strict">

<?php
$s = "m@t.ca";
echo preg_replace ("/^(\w+)@(\w+)\.(\w{2,4})/", "\1 at \2 dot \3", $s);
?>

</source>

==Quote escaping in backreference replacements==



<source lang="html4strict">

<?php
$html = "<code> It"s bold </code>";
print preg_replace("@<code>(.*?)</code>@e","html_entity_decode("$1")", $html);
print "\n";
$html = "<code> "This" is italic. </code>";
print preg_replace("@<code>(.*?)</code>@e","html_entity_decode("$1")", $html);
print "\n";
?>

</source>

==Regular Expression Replacements==



<source lang="html4strict">

<?
$a = "Foo moo boo tool foo";
$b = preg_replace("/[A-Za-z]oo\b/", "Got word: $0\n", $a);
print $b;
?>

</source>

==Remove any doubled-up whitespace==



<source lang="html4strict">

<?php
$str = " This line contains\tliberal \r\n use of whitespace.\n\n";
$str = preg_replace("/\s(?=\s)/", "", $str);
// Echo out: "This line contains liberal use of whitespace."
echo "<pre>{$str}</pre>";
?>

</source>

==Replace any non-space whitespace, with a space==



<source lang="html4strict">

<?php
$str = " This line contains\tliberal \r\n use of whitespace.\n\n";

$str = preg_replace("/[\n\r\t]/", " ", $str);

// Echo out: "This line contains liberal use of whitespace."
echo "<pre>{$str}</pre>";
?>

</source>

==Replace with regular expression==



<source lang="html4strict">

<?php
$teststring = ""Hello" and "Goodbye."";
$greedyresult = preg_replace("/".*"/", ""***"", $teststring);
$nongreedyresult = preg_replace("/".*?"/", ""***"", $teststring);
echo "Original: $teststring\n";
echo "Greedy Replace: $greedyresult\n";
echo "Non-Greedy Replace: $nongreedyresult\n";
?>

</source>

==Replacing URLs with Links==



<source lang="html4strict">

<?php
$hostRegex = "([a-z\d][-a-z\d]*[a-z\d]\.)*[a-z][-a-z\d]*[a-z]";
$portRegex = "(:\d{1,})?";
$pathRegex = "(\/[^?<>#\"\s]+)?";
$queryRegex = "(\?[^<>#\"\s]+)?";
$urlRegex = "/(?:(?<=^)|(?<=\s))((ht|f)tps?:\/\/" . $hostRegex . $portRegex . $pathRegex . $queryRegex . ")/";
$str = "http://home.example.ru.";
$str2 = "http://home.example.ru:8181/index.php";
echo $urlRegex . "\n";
$sample1 = preg_replace($urlRegex, "<a href=\"\\1\">\\1</a>", $str);
$sample2 = preg_replace($urlRegex, "<a href=\"\\1\">\\1</a>", $str2);
echo $sample1 . "\n";
echo $sample2 . "\n";
?

</source>

==Replacing using backreferences==



<source lang="html4strict">

$members=<<<TEXT
Name E-Mail Address
------------------------------------------------
A i@example.ru
D k@example.ru
M m@example.org
B b@example.net
TEXT;
print preg_replace("/([^@\s]+)@(([-a-z0-9]+\.)+[a-z]{2,})/",
"\\1 at \\2", $members);

</source>

==Replacing with preg_replace()==



<source lang="html4strict">

$members=<<<TEXT
Name E-Mail Address
------------------------------------------------
A i@example.ru
D k@example.ru
M m@example.org
B b@example.net
TEXT;
print preg_replace("/[^@\s]+@([-a-z0-9]+\.)+[a-z]{2,}/",
"[ address removed ]", $members);

</source>

==Using Back References with preg_replace()==



<source lang="html4strict">

//converts dates in dd/mm/yy format to mm/dd/yy format:

<?
$test = "25/12/2000";
print preg_replace("|(\d+)/(\d+)/(\d+)|", "$2/$1/$3", $test);
?>

</source>

==Using preg_replace() to Replace Patterns==



<source lang="html4strict">

<?
$test = "this is a test.";
print preg_replace("/a test/", "another test", $test);
?>

</source>

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PHP/String/preg replace - История изменений

в 10:37, 26 мая 2010

Admin: 1 версия