Need a solution to only accept numbers that do not start with zero, but can contain zeros after the first digit. Currently using var.replace(/[^1-9]/g, ''); which prevents input of 0 altogether.
Examples of valid inputs:
10
9990
Examples of invalid inputs:
01
0999
The desired functionality is to disallow entry of 0 at the beginning of the number. If 0 is entered in the first position, it should be replaced with a blank space. This is the expected behavior.
If you need to verify whether the initial value is not zero, a simple substr can be used:
Inputvalue.substr(0,1) !== '0'
If you wish to replace all leading zeros:
Inputvalue.replace(/^0+/, '');
The ^ denotes 'string begins with', followed by 'one or more' (+) zeros.
To replace all leading zeros before a digit (\d):
Inputvalue.replace(/^0+\d/, '');
The ^ indicates 'string starts with', proceeded by 'one or more' (+) zeros.
If your goal is to extract the first digit following the zeros:
The ^ symbol signifies 'start of string'. For instance, in 000001, the 1 isn't at the beginning of the string, thus it won't match.
I often find it useful to describe my objectives:
[1-9]^) one or more (+) zeros -> ^0+This leads to ^0+[1-9].
To solely capture the digit, enclose it in a group: ^0+([1-9])
const examples = [
'123', // no starting zeroes
'0123', // matching
'000123', // matching
'132000123', // no matching zeros, also no match towards the end!
];
console.log(examples.map(function (example) {
const matches = example.match(/^0+([1-9])/);
return example + ' -> ' + (matches !== null ? matches[1] : 'no match!');
}));To ensure that the first digit is not zero, you can utilize a negative lookahead:
var example = [
'0123',
'000001',
'abc',
'123',
'102030',
];
console.log(example.map(function (item) {
return item + ' : ' + /^(?!0)\d+$/.test(item);
}));The escape sequence \d can be used to match any digit between 0 and 9.
To ensure that the number does not start with zero, we can specify it using [1-9].
Therefore, the final regular expression will take the form: /^[1-9]\d*$/g.
This regex pattern will accurately identify any positive number that is not zero at the beginning of a string.
By utilizing this regex pattern, you have the ability to automatically validate form inputs.
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