A message is selected if it comes from one of the specified source files,
or if it comes from one of the specified domains,
or if -J is given and its context (msgctxt) matches MSGCTXT-PATTERN,
or if -K is given and its key (msgid or msgid_plural) matches MSGID-PATTERN,
or if -T is given and its translation (msgstr) matches MSGSTR-PATTERN,
or if -C is given and the translators comment matches COMMENT-PATTERN,
or if -X is given and the extracted comment matches EXTRACTED-COMMENT-PATTERN.
When more than one selection criterion is specified, the set of selected
messages is the union of the selected messages of each criterion.
MSGCTXT-PATTERN or MSGID-PATTERN or MSGSTR-PATTERN or COMMENT-PATTERN or
[-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.
select messages extracted from SOURCEFILE
select messages belonging to domain DOMAINNAME
start of patterns for the msgctxt
start of patterns for the msgid
start of patterns for the msgstr
start of patterns for the translators comment
start of patterns for the extracted comment
PATTERN is an extended regular expression
PATTERN is a set of newline-separated strings
use PATTERN as a regular expression
obtain PATTERN from FILE
ignore case distinctions
output only the messages that do not match any