forked from lix-project/lix
976df480c9
The function ‘builtins.match’ takes a POSIX extended regular
expression and an arbitrary string. It returns ‘null’ if the string
does not match the regular expression. Otherwise, it returns a list
containing substring matches corresponding to parenthesis groups in
the regex. The regex must match the entire string (i.e. there is an
implied "^<pat>$" around the regex). For example:
match "foo" "foobar" => null
match "foo" "foo" => []
match "f(o+)(.*)" "foooobar" => ["oooo" "bar"]
match "(.*/)?([^/]*)" "/dir/file.nix" => ["/dir/" "file.nix"]
match "(.*/)?([^/]*)" "file.nix" => [null "file.nix"]
The following example finds all regular files with extension .nix or
.patch underneath the current directory:
let
findFiles = pat: dir: concatLists (mapAttrsToList (name: type:
if type == "directory" then
findFiles pat (dir + "/" + name)
else if type == "regular" && match pat name != null then
[(dir + "/" + name)]
else []) (readDir dir));
in findFiles ".*\\.(nix|patch)" (toString ./.)
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|---|---|---|
| .. | ||
| affinity.cc | ||
| affinity.hh | ||
| archive.cc | ||
| archive.hh | ||
| hash.cc | ||
| hash.hh | ||
| local.mk | ||
| md5.c | ||
| md5.h | ||
| md32_common.h | ||
| monitor-fd.hh | ||
| regex.cc | ||
| regex.hh | ||
| serialise.cc | ||
| serialise.hh | ||
| sha1.c | ||
| sha1.h | ||
| sha256.c | ||
| sha256.h | ||
| types.hh | ||
| util.cc | ||
| util.hh | ||
| xml-writer.cc | ||
| xml-writer.hh | ||