正则表达式，用于除数字0以外的任何字母数字字符

Question

For non-zero I have /^[1-9][0-9]*$/ , and for alphanumeric ^[0-9a-zA-Z ]+$ , but I don't know how to combine these.

Please help with regex for any alphanumeric pattern except a single 0

Answer 1

You can use this pattern to prevent matches starting with 0

^(?!0)[0-9a-zA-Z ]+$

If 01 is ok but not just 0 use this pattern

^(?!0$)[0-9a-zA-Z ]+$

Answer 2

here what you need :

/^[1-9a-zA-Z ]+$/

Explaination :Allow numbers from 1 to 9, char from A to Z (non sensitive case) and space allowed.

Answer 3

Without lookahead you can use:

^[1-9a-zA-Z][0-9a-zA-Z ]*$

Of course with lookahead it is shorter:

^(?!0$)[0-9a-zA-Z ]+$

Answer 4

There are many good answers to this question.

But considering the OP's question, I believe the best way to do this would be:

(^[1-9a-zA-Z ]$|^[1-9a-zA-Z ][0-9a-zA-Z ]+$)

• ^[1-9a-zA-Z ]$ if there is only one character

• ^[1-9a-zA-Z ][0-9a-zA-Z ]+$ if more than one character.

Answer 5

I am sorry, none of these worked and I had to read manual and come up with the one that worked. I was aided by the answers posted by others.

([^0]|[0-9a-zA-Z_ ]{2,}&)

if one character, not a single zero. If more than one character, number, letter, underscore and space are a go.

Tested as follows:

$string0 = 0;
$string1 = 1;
$string2 = 9;
$string3 = '1 - 3 Million'; // is telling this is zero
$string4 = 'false';
$string5 = '0 - 3 Million';
$string6 = '011';
$regex = '([^0]|[0-9a-zA-Z_ ]{2,}&)';
$modifiers = '';
$exp = chr(1) . $regex . chr(1) . $modifiers;
$expresion = $exp;
echo 'CHR(1):'.chr(1).' END';
echo '<br/>';
echo 'EXPRESSION 1:'.$exp.' END';
echo '<br/>';
echo 'Is this non-zero? '.preg_match($expresion, $string0);
echo '<br/>';
echo 'Is this non-zero? '.preg_match($expresion, $string1);
echo '<br/>';
echo 'Is this non-zero? '.preg_match($expresion, $string2);
echo '<br/>';
echo 'Is this non-zero? '.preg_match($expresion, $string3);
echo '<br/>';
echo 'Is this non-zero? '.preg_match($expresion, $string4);
echo '<br/>';
echo 'Is this non-zero? '.preg_match($expresion, $string5);
echo '<br/>';
echo 'Is this non-zero? '.preg_match($expresion, $string6);

OUTPUT

EXPRESSION 1:([^0]|[0-9a-zA-Z_ ]{2,}&) END
Is this non-zero? 0
Is this non-zero? 1
Is this non-zero? 1
Is this non-zero? 1
Is this non-zero? 1
Is this non-zero? 1
Is this non-zero? 1