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Static regex for embedded systems

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Many times I need to parse/decode a text string that comes from an 
external system, over a serial bus, MQTT, and so on.

Many times this string has a fixed syntax/layout. In order to parse this 
string, I everytime create a custom parser that can be tedious, 
cumbersom and error prone.

For example, suppose you have to decode a string from a modem that uses 
AT commands. Many answers from the modem has the following schema:

   \r\n+<prefix>: <field1>,<field2>\r\n
   \r\nOK\r\n

The prefix is known, the number and type of fileds are known too. With 
regex, the parser would be simple.

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Static regex for embedded systems pozz <pozzugno@gmail.com> - 2025-01-21 15:31 +0100
  Re: Static regex for embedded systems David Brown <david.brown@hesbynett.no> - 2025-01-21 16:40 +0100
  Re: Static regex for embedded systems Stefan Reuther <stefan.news@arcor.de> - 2025-01-21 17:03 +0100
    Re: Static regex for embedded systems pozz <pozzugno@gmail.com> - 2025-01-21 18:03 +0100
      Re: Static regex for embedded systems Hans-Bernhard Bröker <HBBroeker@gmail.com> - 2025-01-21 20:40 +0100
      Re: Static regex for embedded systems "Niocláiſín Cóilín de Ġloſtéir" <Master_Fontaine_is_dishonest@Strand_in_London.Gov.UK> - 2025-01-22 00:41 +0100
      Re: Static regex for embedded systems George Neuner <gneuner2@comcast.net> - 2025-01-21 19:38 -0500
        Re: Static regex for embedded systems David Brown <david.brown@hesbynett.no> - 2025-01-22 10:59 +0100
          Re: Static regex for embedded systems George Neuner <gneuner2@comcast.net> - 2025-01-22 18:23 -0500
        Re: Static regex for embedded systems Stefan Reuther <stefan.news@arcor.de> - 2025-01-22 17:53 +0100
          Re: Static regex for embedded systems George Neuner <gneuner2@comcast.net> - 2025-01-22 18:33 -0500

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