Search For Particular Characters 1

likelylad · Apr 15, 2004

What I would like to do is to search for all characters that exist between Alt0128 to Alt0255 in the ISO8859-1 character map.

I would prefer to search by the Alt key if possible.

I know I should be using something similar to the following

preg_match_all("/[A-Za-z0-9]/",$line1,$chars1);

but I want to replace A-Za-z0-9 with Alt0128-Alt0255

Hopefully I am explaining myself properly.

Thanking in advance for any help received

sleipnir214 · Apr 15, 2004

You mean those characters you can access on Win32 by holding down ALT, entering a 4-digit numerical string, then letting up the ALT key? Those are just ASCII high-order characters.

For example, with the following HTML:

Code:

<html><body>
	<form method="post" action="/test_input.php">
		<input type="text" name="foo"><br>
		<input type="submit">
	</form>
</body></html>

Submitting to the following script, test_input.php:

Code:

<?php
print ord($_POST['foo']);
?>

If I point a browser to the HTML page, enter in the text box ALT+0233 (the "[&eacute']" character) and submit, I get the return:

233

In the preg_* family of functions, you can specify the ASCII of a character in octal, so you can use a match pattern like '/[\200-\377]/' to find these characters.

Modifying test_input.php as:

Code:

<?php
if (preg_match ([blue]'/[\200-\377]/'[/blue], $_POST['foo']) == 0)
{
	print 'not ';
}

print 'found';

?>

Lets me search for a high-order character in a string

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Search For Particular Characters 1

likelylad

IS-IT--Management

sleipnir214

Programmer

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