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Thanks all for your answers. Iknow that what I ask is not possible with standard regular expressions. But \b and others are made to allow for more control on what is *matched" and go a bit beyond regex power. When writing emacs modes it is particularly important to have the exact matched string...

Hi, a little question to emacs lisp regex experts. I am a user of the \b \B \< \> special regex that match empty regex at special position. But I am stuck on the following: Is it possible to define a regex that matches an empty string after a space? Or, as a workaround to this in my case, is it poss...