Backward running version look-behinds
waldemar at google.com
Wed Dec 30 22:56:56 UTC 2015
On 12/11/2015 13:16, Nozomu Katō wrote:
> I wonder if the person who wrote the spec for RegExp is on this list. I
> would like to ask one question: Was there any reason why the following
> steps were defined in the present order:
> 22.214.171.124 Alternative
> The production Alternative :: Alternative Term evaluates as follows:
> 1. Evaluate Alternative to obtain a Matcher m1.
> 2. Evaluate Term to obtain a Matcher m2.
> instead of:
> The production Alternative :: Term Alternative evaluates as follows:
> 1. Evaluate Term to obtain a Matcher m1.
> 2. Evaluate Alternative to obtain a Matcher m2.
> or, was it a matter of preference? If any side effect I am missing
> exists in the latter order, I need to reconsider or abandon my compact
Those appear to have equivalent behavior. I just picked one when writing the RegExp spec.
More information about the es-discuss