javascript - String split with RegExp returns empty strings at either end - 


// pattern -- <some name optional 1/2/3 @ end separated _> var re = new regexp("^\(.*\)_\([1-3]\)$") "".split(re)  // returns [""] --- ok "abc_d_4".split(re)  // returns ["abc_d_4"] --- ok "abc_d_3".split(re) // returns ["", "abc_d", "3", ""] --- whoa! hoped-for ["abc_d", "3"] // similarly, "_3".split(re), "abc_d_3_4_3".split(re)

why empty strings @ either end in last case, , how avoid that? appreciate explanation.

i can see similar questions have been asked before on not case (or pl point me there)

moved comment (per request).

try split on /_(?=[1-3]$)/


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