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I am pretty sure this question has been asked before but my Super Search fu is weak.

The Dictionary:

Use the official '2of12inf.txt' file from here stripped of all non-alpha characters and forced to lowercase.

while (<$dict_fh>) { $_ = lc($_); tr/a-z//cd; # ... }

The Input:

The code should accept a file name as a command line argument. The file will contain a list of strings, one on each line. The string needs to be forced to lowercase with all non-alpha characters removed like the dictionary above.

penisland howareyou

The Output:

For each line of input, the code should output all possible substrings (separated by whitespace) with the following constraints:

  • Substrings should appear in the order they appear in the string
  • In other words, the substrings stripped of whitespace should be the input string
  • Every substring should be either exactly a word from the dictionary or a substring containing no word from the dictionary as a further substring
  • "ehim" is an invalid substring because it contains "eh", "hi" and "him" as substrings.
  • All substrings that do not contain a word from the dictionary should be as long as possible
  • "wz" followed by "gt" is not valid because "wzgt" does not contain any word from the dictionary.
  • The list should be ordered with the fewest number of non-word characters then by fewest number of total substrings



pen island penis land pen is land penis l land pen is l and

For a somewhat similar challenge, see One for the weekend: challenge. Note: The example above was done by hand and could possibly not include all possibilities.

Cheers - L~R

Update: Clarified constraint two thanks to /msg from ikegami
Update: Clarified example thanks to /msg from blokhead and ikegami

In reply to Challenge: "Words" In A String by Limbic~Region

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