Regarding Ray Paseur's comment, the strings hash to:0e4620974319065090195629887368540e830400451993494058024219903391The odds of getting a hash exactly matching the format /^0+e[0-9]+$/ are not high but are also not negligible.It should be added as a general warning for all hash functions to always use the triple equals === for comparison.Actually, the warning should be in the operators section when comparing string values! There are lots of warnings about string comparisons, but nothing specific about the format /^0+e[0-9]+$/.