Question

I’m still a newb when it comes to using regular expressions. I am trying to set up a regular expression where “0” will never match if it is by itself. I have 5 test expressions. The last 4 should match and the first one shouldn’t. However I can seem to only get the middle3 to match. How can i set it to get the last one to match as well?

<?php
$data1='0';
$data2='New Triggered By Test 01';
$data3='Hello';
$data4='01 Test';
$data5='00';

$pattern='/[^0]{1}/';

echo preg_match($pattern,$data1);

echo preg_match($pattern,$data2);

echo preg_match($pattern,$data3);

echo preg_match($pattern,$data4);

echo preg_match($pattern,$data5)
?>

Answer 1

What you want to match is

• A single char that’s not 0
• Or more than one char

Try this one:

"#^([^0]|.{2,})$#"

Commented:

"/^      # begining of the input string
(
  [^0]   # one char, everything but zero
  |.{2,} # or any sequence of more than one char
)$/"

---

Test script:

$inputs = array(
    '0',
    'New Triggered By Test 01',
    'Hello',
    '01 Test',
    '00',
);

foreach($inputs as $input) {
    echo "$input: ";

    if (preg_match("#^([^0]|.{2,})$#", $input)) {
        echo "OK\n";
    } else {
        echo "NOT OK\n";
    }
}