New rule function "backtrack" & reflect #

[pragmatic]

I believe the following rule functions would be quite useful:

Code:

Reflect | FN | Duplicate word reversed N times Backtrack | BN | Duplicate word reversed except for last character N times Backtrack | b | Duplicate word reversed except for last character F1 | p@ssW0rd | p@ssW0rddr0Wss@p B1 | p@ssW0rd | p@ssW0rdr0Wss@p b | p@ssW0rd | p@ssW0rdr0Wss@p (b/B1 & f/F1 are equivalent just as d/p1 are equivalent) F2 | p@ssW0rd | p@ssW0rddr0Wss@pp@ssW0rd B2 | p@ssW0rd | p@ssW0rdr0Wss@p@ssW0rd

The value of this is emphasized by googling a few keyboard patterns.

Code:

pattern : generically expressible by : proposed expression : google hits qwert (x2) qwerttrewq : f : f : 10,300 qwertrewq : N/A : b : 79,000 qwert (x3) qwerttrewqqwert : N/A : F2 : 660 qwertrewqwert : N/A : B2 : 1,170 qwerty (x2) qwertyytrewq : f : f : 64,700 qwertytrewq : N/A : b : 9,730 qwe (x3) qweewqqwe : N/A : F2 : 30,200 qwewqwe : N/A : B2 : 86,200 qwe (x4) qweewqqweewq : (f p1) : B3 : 13,900 qwewqwewq : N/A : F3 : 17,900 qwertyuiop (x2) qwertyuioppoiuytrewq : f : f : 7,340 qwertyuiopoiuytrewq : N/A : b : 4,360 123456789 (x2) 123456789987654321 : f : f : 685,000 12345678987654321 : N/A : b : 410,000

As shown by the google hits this idea of not repeating the end character of a pattern before reversing the pattern seems to be roughly as popular (generally the same order of magnitude) as it is to repeat it.

I should clarify that all of the above that are marked as inexpressible can actually be expressed but not generically. They require multi-part duplicate/swap/delete rules that are specific to the input word length (and become increasingly complicated the more sweeps are done). The above proposal creates a general solution that easily allows for multiple sweeps through a pattern without worrying about input lengths.

Finally, as I was writing this I noticed that there is an error in the rules wiki page on the example for the pN function. It shows the following:

Code:

p3 | Pass | PassPassPass

this should be "p2"

Thanks!