PHP Reges not working

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12-08-2012, 11:55 PM
manishrathi

PHP Reges not working

PHP Code:

<html> <head> </head> <body> 2) Create a string, search for a word in that string. If the word is found display word found. If not found display a message saying word not found.<br /> <?php $subject = "I learn web development "; $pattern = '/web/'; // I have also tried /^web$/ and /^web/ preg_match($pattern, $subject, $matches); echo $matches[0]; ?></body> </html ss

When I use this code, I am getting output as follows
2) Create a string, search for a word in that string. If the word is found display word found. If not found display a message saying word not found.
Array

Please suggest whats wrong and why am I not getting output as "web"

Thanks
12-09-2012, 12:41 AM
NogDog

Works fine for me. You don't by any chance actually have a 4th parameter in your call to preg_match(), do you, as that would change the structure of the $matches array. You could try something like this to get some more info:

PHP Code:

<html> <head> </head> <body> 2) Create a string, search for a word in that string. If the word is found display word found. If not found display a message saying word not found.<br /> <?php $subject = "I learn web development "; $pattern = '/web/'; // I have also tried /^web$/ and /^web/ if(preg_match($pattern, $subject, $matches)) { if( ! is_string($matches[0])) { echo "<pre>DEBUG\n".var_export($matches,true)."</pre>\n"; } else { echo $matches[0]; } } else { echo "[not found]"; } ?></body> </html>

PS: For something like this where you do not need the power of regular expressions, strpos() or stripos() along with substr() would probably be more efficient.
12-09-2012, 11:02 AM
manishrathi

<html>
<head>

</head>
<body>
2) Create a string, search for a word in that string. If the word is found display word found. If not found display a message saying word not found.<br />
<?php
$subject = "I learn web development ";
$pattern = '/^web$/';
preg_match($pattern, $subject, $matches);
echo $matches[0];
?></body>
</html >

It does non work with this regex

I am getting following output

Quote:

Notice: Undefined offset: 0 in C:\wamp\www\PHP_Assignment_3_StringAssignments.php on line 23
12-09-2012, 01:01 PM
007Julien

Your pattern is wrong ! Replace It by '/web/';

'/^web/' matches web only at the beginning of the string,
'/web$/' matches web only at the end of the string.
Then '/^web$/' matches only web in 'web' string !
12-09-2012, 02:06 PM
manishrathi

I see.
I want to match only web word in entire string. If I make pattern as /web/, then it will match web anywhere in the string like webdevelopment, spiderweb etc. But I want only web word, mentioned separately in the entire string to be matched. How to do that ?

Thanks
12-09-2012, 05:30 PM
NogDog

PHP Code:

'/\bweb\b/i'

"\b" is "word boundary"
"i" after the closing delimiter is case-insensitive modifier