procmail regular expressions matching e-mail subjects: sometimes blanks are not blanks

  • I had written a specific procmail rule a while ago,
  • it had worked for quite a while,
  • for quite some while now it had not worked as expected;
  • I had a look at the header lines as displayed by my e-mail reader,
  • I also had a look at my procmail LOGFILE;
  • the subject line looked rather differently,
  • all the blanks were rather ‘_’, i.e. underscore characters, that’s because the subject wasn’t in 7-bit ASCII but rather in UTF-8;
  • for readability I now match this by the ‘.’ wild card, I think, that’s good enough.

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