Each time CFEngine matches a string, these values are assigned to a special variable context $(match.*n*). The fragments can be referred to in the remainder of the promise. There are two places where this makes sense. One is in pattern replacement during file editing, and the other is in searching for files.
code
bundle agent testbundle
{
files:
"/home/mark/tmp/(cf[23])_(.*)"
create => "true",
edit_line => myedit("second $(match.2)");
# but more specifically...
"/home/mark/tmp/cf3_(test)"
create => "true",
edit_line => myedit("second $(match.1)");
}
A string matching the complete regular expression whether or not back-references were used in the pattern.
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