Java Utililty Methods Regex Number Validate

List of utility methods to do Regex Number Validate

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Description

The list of methods to do Regex Number Validate are organized into topic(s).

Method

booleanisNumber(String str)
is Number 
if (str == null) {
    return true;
String regExp = "^(-|\\+)?\\d+(\\.\\d+)?$";
Pattern pattern = Pattern.compile(regExp);
return pattern.matcher(str).matches();
booleanisNumber(String str)
is Number 
java.util.regex.Pattern pattern = java.util.regex.Pattern.compile("[0-9]*");
java.util.regex.Matcher match = pattern.matcher(str);
return match.matches();
booleanisNumber(String str)
is Number 
if (isEmpty(str)) {
    return false;
Matcher matcher = numberPattern.matcher(str);
return matcher.matches();
booleanisNumber(String str)
is Number 
boolean bool = false;
String regex = "[0-9]*";
bool = check(str, regex);
return bool;
booleanisNumber(String str, String sign)
is Number 
String regex = "";
if ("+".equals(sign)) {
    regex = "^[+]?[0-9]*$";
} else if ("-".equals(sign)) {
    regex = "^[-][0-9]*$";
} else {
    regex = "^[+-]?[0-9]*$";
return match(regex, str);
booleanisNumber(String value)
Check if the value is a digit 
return Pattern.matches("[0-9].*", value);
booleanisNumber(String value)
is Number 
return isDouble(value) || isInteger(value);
booleanisNumber(String value)
is Number 
return isEmpty(value) ? false : NUMBER_PATTERN.matcher(value).matches();
booleanisNumber_Lowerletter_Underline(String str)
is Numbe Lowerlette Underline 
boolean flag = false;
Pattern p = Pattern.compile("[A-Z0-9]*");
;
Matcher m = p.matcher(str);
;
flag = m.matches();
return flag;
booleanisNumberForLength(String numStr, int length)
is Number For Length 
String regex = "[0-9]{" + length + "}";
return numStr != null && Pattern.matches(regex, numStr);