javascript - Ask the regular expert, if the search starts with a decimal point, add 0 in front of the decimal point

Question

Cause of the problem:
Project environment php+oracle, if the data taken out from oracle is a number less than 1, the result will be 0, such as: '0.8', and the result will be displayed on the page It becomes '.8'. After reading Oracle's tutorial, I found that the solution is to_char before taking the value. However, because there are too many fields, it is very troublesome to do this. I plan to replace it with regular expression.

Example:
.5=>0.5
.03=>0.03

Answer 1

$number = '.5';
$number = preg_replace('/^(\.\d+)/', '0$1', $number);
echo $number;

Answer 2

0+.5 will become 0.5, the simplest way I can think of

Answer 3

$num = ".8";
$res = preg_replace('/^.(d+)/', '0.${1}', $num);
The obtained $res is just

Answer 4

reg = /^\./;
var arr = ['.5', '.03', '4']
for (let i = 0, len = arr.length; i < len; i++) {
    console.log(arr[i], arr[i].replace(reg,'0.'))
}

Answer 5

Direct var_dump((float)$str);