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That creates a regular expression that matches one or more digits.
Anything inside / / is a regular expression. \d matches a digit, and + is the positive closure, which means one or more.
/ /
\d
+
Having said that, depending on what this regex is supposed to do, you may want to change it to:
var INTEGER_SINGLE = /^\d+$/;
^ matches the beginning of the string, and $ the end. The end result would be that any strings you try to match against the regex would have to satisfy it in the string's entirety.
^
var INTEGER_SINGLE = /^\d+$/; console.log(INTEGER_SINGLE.test(12)); //true console.log(INTEGER_SINGLE.test(12.5)); //false
Of course if the regex is supposed to only match a single integer anywhere in the string, then of course it's perfect just the way it is.