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Re: Use the characters "+" and "-" in regular expressions


From: steve-humphreys
Subject: Re: Use the characters "+" and "-" in regular expressions
Date: Wed, 19 May 2021 18:26:29 +0200

   I want to match a space followed by a series of "+" or "-" or "."


   Sent: Thursday, May 20, 2021 at 4:17 AM
   From: "Skip Montanaro" <skip.montanaro@gmail.com>
   To: steve-humphreys@gmx.com
   Cc: "Help Gnu Emacs" <help-gnu-emacs@gnu.org>
   Subject: Re: Use the characters "+" and "-" in regular expressions

     Is there a way to use the character "+" and "-" in regular
     expressions?


   Yes, use character sets, e.g. [+] and [-]. If more characters are in a
   set along with a hyphen, that hyphen needs to be the first element of
   the set so as not to be interpreted as defining a range of characters.
   So, the character set containing 0, 9 and hyphen is [-09] or [-90], not
   [0-9], which would include all digits between 0 and 9, but not the
   hyphen.

   Skip


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