This is what I found when I was wondering that:

http://stackoverflow.com/questions/4724588/using-alternation-or-character-class-for-single-character-matching

Also:

http://stackoverflow.com/questions/22132450/why-is-a-character-class-faster-than-alternation

Basically character classes are faster, designed for single characters, and 
more readable.

Cheers


> On 2017-05-09, at 14:10, Jean-Christophe Helary 
> <[email protected]> wrote:
> 
> I'm wondering if [] and | are equivalent for single characters or if there 
> are marginal cases where they would not be equivalent ?

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