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  • what did you try until now? Commented Mar 10, 2019 at 5:40
  • I did split the large file, delete the partial files, which did contain my regex and assemble them reverse to the whole. However, that is more likely a slower / more dirty process over endless partial files Commented Mar 10, 2019 at 6:41
  • @Olaf Just to be clear, you want to remove the patterns matching your regex from the file. Is that correct? Commented Mar 10, 2019 at 6:45
  • YES. In fact, that are emails, where attachments get removed, with the aging of the mails, as a huge number of clients abuses the mail-servers as storage. After 8 years and longer, several with attachments forwarded, no 35MB email with the attachments is useful. I only want to preserve the textual content Commented Mar 10, 2019 at 6:52