-PATTERN or
EXTRACTED-COMMENT-PATTERN syntax:
  [-E | -F] [-e PATTERN | -f FILE]...
PATTERNs are basic regular expressions by default, or extended regular
expressions if -E is given, or fixed strings if -F is given.

  -N, --location=SOURCEFILE   select messages extracted from SOURCEFILE
  -M, --domain=DOMAINNAME     select messages belonging to domain DOMAINNAME
  -J, --msgctxt               start of patterns for the msgctxt
  -K, --msgid                 start of patterns for the msgid
  -T, --msgstr                start of patterns for the msgstr
  -C, --comment               start of patterns for the translator's comment
  -X, --extracted-comment     start of patterns for the extracted comment
  -E, --extended-regexp       PATTERN is an extended regular expression
  -F, --fixed-strings         PATTERN is a set of newline-separated strings
  -e, --regexp=PATTERN        use PATTERN as a regular expression
  -f, --file=FILE             obtain PATTERN from FILE
  -i, --ignore-case           ignore case distinctions
  -v, --invert-match          output only the messages that do not match any
                              selection criterion