The Plus Sign (+) special character is used in JavaScript regular expressions to match one or more occurrences of the previous item.
var NumberToTest = '1234';
var IsFound = /^\d+$/.test(NumberToTest);
alert(IsFound);
The preceding code will return true for any length of digits that begin and end with a digit.
Related articles:
JavaScript Regular Expressions
JavaScript Regular Expression Special Characters: $ ^
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