php,regex,preg-match,conditional , Reguralexpresion which accepts valid float numbers [PHP]


Reguralexpresion which accepts valid float numbers [PHP]

Question:

Tag: php,regex,preg-match,conditional

I am trying to verify a valid float number. Basically i want to accept numbers with up to four numbers after the coma:

0,2342
123412,2300
1234.0000
1244
1234,12
1234.12
0.23

I also want to reject the numbers with 0 on the front, but pass the 0 if its on its own before the dot or coma.

01234,1234
00012.2342
01,1234

I used this expresion but this did not work as I expected:

$number_exp = "<^[0]?([^0][0-9]+)?[.|,]?[0-9]{0,4}$>";
$test = '0123,4342';

if(preg_match($number_exp, $test)) return true;
return false;

Anyone knows how to condision the statment so it will accept 0 only if its on its own before the delimiter?


Answer:

All you need is play with capture grouping .You can use the following regex :

^(([1-9]+|0|[1-9]+?0)([.,][0-9]{0,4})?)$

Demo

Also note that [^0] is an incorrect regex because it will match everything except 0 so it will match characters or ...


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