str_replace for exact match

[pankajit09]

Hello,

$x = "tyu"
 
$y="3"
 
$eq = "asa+tyu-tyut+1"
 
$result = str_replace($x,$y,$eq);
 
echo $result;

$result has "asa+3-3t+1"

I expect "asa+3-tyut+1"

Please help .

[dlite922]

Hello,

$x = "tyu"
 
$y="3"
 
$eq = "asa+tyu-tyut+1"
 
$result = str_replace($x,$y,$eq);
 
echo $result;

$result has "asa+3-3t+1"

I expect "asa+3-tyut+1"

Please help .

That's pretty difficult to do, if not impossible unless you find some other pattern in your string.

use preg_replace() http://us2.php.net/preg_replace

to implent some kind of pattern...

for example

does it always end with t, those that end with "t" do not replace?

does it have to end with "-" everytime?

should it end with any characters except a through z?

This will help you find a regex that can do what you want.

I'm no regex expert but I think if it comes down to that and you have all your constraints, we can build one, experiment and make it work together.



-Dan

[pankajit09]

That's pretty difficult to do, if not impossible unless you find some other pattern in your string.

use preg_replace() http://us2.php.net/preg_replace

to implent some kind of pattern...

for example

does it always end with t, those that end with "t" do not replace?

does it have to end with "-" everytime?

should it end with any characters except a through z?

This will help you find a regex that can do what you want.

I'm no regex expert but I think if it comes down to that and you have all your constraints, we can build one, experiment and make it work together.



-Dan

Yes you are right.

I am using -->

$eq = preg_replace("/\b".$param."\b/", $paramData, $eq);