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authorEelco Dolstra <eelco.dolstra@logicblox.com>2014-11-25T10·47+0100
committerEelco Dolstra <eelco.dolstra@logicblox.com>2014-11-25T10·47+0100
commit976df480c918f050608f7a23a4a21415c43475c3 (patch)
tree41463834cb5e30bd50c719f6ccaa8ecdb3a8a976 /doc/manual/local.mk
parent4e340a983f928973d3915455d46a4bbadbc3269c (diff)
Add a primop for regular expression pattern matching
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 ./.)
Diffstat (limited to 'doc/manual/local.mk')
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