PHP Regex help

<?php
$test = '-1 -134123 -1 -1';
preg_match_all("/\b-1\b/" , $test , $match);
print_r($match);
?>

PHP:

i am trying to match only -1 and not -1224 (that is why i used boundaries) but code does not work (it works for positive numbers)

 

preg_match_all("|(-[0-1]{1})|" , $test , $match);

PHP:

Should match negative any 1 number. I don't think so, but you might need to escape the negative sign.

Peace,

 

It matches but i tried adding boundaries and it doesnt work.

 

Try -1[^0-9]

That means -1 and it cant be followed by a number. I don't know about boundary, but if you using doublequote, you need to escape it \\b

 

This work

$test = '-1 -134123 -1 -1';
preg_match_all("~-1( |$)~" , $test , $match);
print_r($match);

Code (markup):

 

using \\b doesnt work and -1[^0-9] doesnt solve my purpose .. Thanks for helping though
Edit this works great beacon Thanks! what if i want it to match -1 or 1 ?

 

Put a ? after the -

Jay

 

I think the problem lies with you using double quotes and the \. Use
'/\b\-1\b/'

 

@jayshah - doesnt work ...
@JAY6390 - this doesnt work too...

 

Use

<?php
$test = '-1 -134123 -1 -1';
preg_match_all('/\-1\b/' , $test , $match);
print_r($match);

PHP:

it returns

Array
(
    [0] => Array
        (
            [0] => -1
            [1] => -1
            [2] => -1
        )

)

Code (markup):