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Question: Intended semantics for setting lastIndex? #477

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littledan opened this Issue Mar 15, 2016 · 2 comments

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@littledan @allenwb @domenic @bterlson
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littledan commented Mar 15, 2016

In https://tc39.github.io/ecma262/#sec-regexpbuiltinexec step 12.a.iii, lastIndex is set to 0 regardless of whether sticky or global is true. However, in all other cases, lastIndex is only set when those flags are present. These semantics were a little surprising to me--were they intentional? I'm curious about the history. This came up for me in code review for implementing part of ES2017 semantics for RegExps https://codereview.chromium.org/1776883005 @allenwb @hashseed
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allenwb Mar 15, 2016

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That's what ES3 and ES 5 did. See:
ES3 15.10.6.2 step 6 and ES5.1 15.10.6.2 step 9.a.i
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allenwb commented Mar 15, 2016

That's what ES3 and ES 5 did. See:
ES3 15.10.6.2 step 6 and ES5.1 15.10.6.2 step 9.a.i

@bterlson bterlson added the question label Mar 18, 2016

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domenic Jul 28, 2016

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Duping to #625.
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domenic commented Jul 28, 2016

Duping to #625.

@domenic domenic closed this Jul 28, 2016

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