Javascript substring check using indexOf or search on a date string with forward slash /
Question
I am surprised to not to find any post regarding this, I must be missing something very trivial. I have a small JavaScript function to check if a string matches an object's properties. Simple stuff right? It works easily with all strings except those which contain a forward slash.
"04/08/2015".indexOf('4') // returns 2 :good
"04/08/2015".indexOf('4/') // returns -1 :why?
The same issue appears to be with .search() function as well. I encountered this issue while working on date strings.
Please note that I don't want to use regex based solution for performance reasons. Thanks for your help in advance!
1 answers
solution1
3 ACCPTED 2015-11-11 17:28:33
Your string has invisible Unicode characters in it. The "left-to-right mark" (hex 200E) appears around the two slash characters as well as at the beginning and the end of the string.
If you type the code in on your browser console instead of cutting and pasting, you'll see that it works as expected.
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