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    This solution is also the most flexible – I had to trim() a string and non breakable spaces were not removed, so rather than replacing and then trimming I did a simple preg_replace("/^\s+|\s+$/u", "", $str). Commented May 17, 2023 at 8:56
  • AFAICS, this will replace all consequent whitespace into one. You may need to remove the + after \s to keep the number of spaces the same. Also, I'm not sure about this, but this may remove the line breaks too. Commented Aug 29, 2023 at 10:16