10 examples of 'javascript check if string contains only numbers' in JavaScript

1
function containsNumber(str) {
2
  return !!str.match(/\d/g);
3
}

19
function isAllDigits(theString) {
20
	for (var i = 0; i < theString.length; i++) {
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		var aChar = theString.substring(i, i + 1)
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		if (aChar < "0" || aChar > "9") {
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			return false;
24
		}
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	}
26
	return true;
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}

15
function getNumbers(string) {
16
  if (isUndefined(string) || !isString(string)) {
17
    return '';
18
  }
19
20
  return String(string).replace(/\D+/g, '');
21
}

62
function isNumber(value) {
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    var patrn = /^(-)?\d+(\.\d+)?$/;
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    if (patrn.exec(value) == null || value == "") {
65
        return false
66
    } else {
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        return true
68
    }
69
}

35
function isValidNumber(value) {
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  const regex = new RegExp('^[-]?[0-9]*$');
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  const result = regex.test(value);
38
39
  return result;
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}

12
protected static hasNumber(value: string): boolean {
13
    return !(/\d/.test(value));
14
}

41
function isNumber(str) {
42
    return /^[-]?\d+(\.\d*)$/.test(str);
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}

8
function validateNumber(num) {
9
  num = (num + '').replace(/\s+|-/g, '');
10
11
  if (!/^\d+$/.test(num)) {
12
    return false;
13
  }
14
15
  var card = cardFromNumber(num);
16
17
  if (card) {
18
    var cardNumbers = A(card.length);
19
20
    return ( cardNumbers.includes(num.length)) && (card.luhn === false || luhnCheck(num));
21
  }
22
23
  return false;
24
}

135
function validateNum(value){
136
    if(/^\d{4,11}$/.test(value)){
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        return true;
138
    }else{
139
        return false;
140
    }
141
}

33
hasNumber(myString) {
34
    return /\d/.test(myString);
35
  }