は、私は言葉の文字列をしましたRubyの正規表現

Question

と文字列のすべての単語の順列をマッチング：

string = "Ruby web framework" 

は、どのように私はすべての可能な単語の順列に合致する正規表現を書くことができますか？

すべての次の文字列が一致する必要があります：

ruby web framework 
web framework ruby 
framework ruby web 

ruby framework web 
framework web ruby 
web ruby framework 

Answer 1

：

pp string.split.permutation.to_a 

[["Ruby", "web", "framework"], 
["Ruby", "framework", "web"], 
["web", "Ruby", "framework"], 
["web", "framework", "Ruby"], 
["framework", "Ruby", "web"], 
["framework", "web", "Ruby"]] 

---

ため息... OK ...ここで私はそれを行うだろうかです：

require 'pp' 

string = "Ruby web framework" 
strings_to_search = string.split.permutation.map{ |p| 'Lorem, ' + p.join(' ') + ' consectetur'} 

strings_to_search << 'Lorem, Ruby consectetur' 
strings_to_search << 'Lorem, Ruby web consectetur' 
strings_to_search << 'Lorem, Ruby Ruby Ruby' 

pp strings_to_search.map{ |p| p.scan(Regexp.union(string.split)) } 

そして、何が起こっているのか：

1.9.2-p290 :001 >  require 'pp' 
true 
1.9.2-p290 :002 > 
1.9.2-p290 :003 >  string = "Ruby web framework" 
"Ruby web framework" 
1.9.2-p290 :004 >  strings_to_search = string.split.permutation.map{ |p| 'Lorem, ' + p.join(' ') + ' consectetur'} 
[ 
    [0] "Lorem, Ruby web framework consectetur", 
    [1] "Lorem, Ruby framework web consectetur", 
    [2] "Lorem, web Ruby framework consectetur", 
    [3] "Lorem, web framework Ruby consectetur", 
    [4] "Lorem, framework Ruby web consectetur", 
    [5] "Lorem, framework web Ruby consectetur" 
] 
1.9.2-p290 :005 > 
1.9.2-p290 :006 >  strings_to_search << 'Lorem, Ruby consectetur' 
[ 
    [0] "Lorem, Ruby web framework consectetur", 
    [1] "Lorem, Ruby framework web consectetur", 
    [2] "Lorem, web Ruby framework consectetur", 
    [3] "Lorem, web framework Ruby consectetur", 
    [4] "Lorem, framework Ruby web consectetur", 
    [5] "Lorem, framework web Ruby consectetur", 
    [6] "Lorem, Ruby consectetur" 
] 
1.9.2-p290 :007 >  strings_to_search << 'Lorem, Ruby web consectetur' 
[ 
    [0] "Lorem, Ruby web framework consectetur", 
    [1] "Lorem, Ruby framework web consectetur", 
    [2] "Lorem, web Ruby framework consectetur", 
    [3] "Lorem, web framework Ruby consectetur", 
    [4] "Lorem, framework Ruby web consectetur", 
    [5] "Lorem, framework web Ruby consectetur", 
    [6] "Lorem, Ruby consectetur", 
    [7] "Lorem, Ruby web consectetur" 
] 
1.9.2-p290 :008 >  strings_to_search << 'Lorem, Ruby Ruby Ruby' 
[ 
    [0] "Lorem, Ruby web framework consectetur", 
    [1] "Lorem, Ruby framework web consectetur", 
    [2] "Lorem, web Ruby framework consectetur", 
    [3] "Lorem, web framework Ruby consectetur", 
    [4] "Lorem, framework Ruby web consectetur", 
    [5] "Lorem, framework web Ruby consectetur", 
    [6] "Lorem, Ruby consectetur", 
    [7] "Lorem, Ruby web consectetur", 
    [8] "Lorem, Ruby Ruby Ruby" 
] 
1.9.2-p290 :009 > 
1.9.2-p290 :010 >  pp strings_to_search.map{ |p| p.scan(Regexp.union(string.split)) } 
[["Ruby", "web", "framework"], 
["Ruby", "framework", "web"], 
["web", "Ruby", "framework"], 
["web", "framework", "Ruby"], 
["framework", "Ruby", "web"], 
["framework", "web", "Ruby"], 
["Ruby"], 
["Ruby", "web"], 
["Ruby", "Ruby", "Ruby"]] 
[ 
    [0] [ 
     [0] "Ruby", 
     [1] "web", 
     [2] "framework" 
    ], 
    [1] [ 
     [0] "Ruby", 
     [1] "framework", 
     [2] "web" 
    ], 
    [2] [ 
     [0] "web", 
     [1] "Ruby", 
     [2] "framework" 
    ], 
    [3] [ 
     [0] "web", 
     [1] "framework", 
     [2] "Ruby" 
    ], 
    [4] [ 
     [0] "framework", 
     [1] "Ruby", 
     [2] "web" 
    ], 
    [5] [ 
     [0] "framework", 
     [1] "web", 
     [2] "Ruby" 
    ], 
    [6] [ 
     [0] "Ruby" 
    ], 
    [7] [ 
     [0] "Ruby", 
     [1] "web" 
    ], 
    [8] [ 
     [0] "Ruby", 
     [1] "Ruby", 
     [2] "Ruby" 
    ] 
] 

あなたが持ったらヒット、THENあなたは受け入れてはいけないものを除外します。あなたがあまりにも扱いにくくなり、メンテナンスの悪夢となるパターンを作るので、正規表現でそれをすべてやろうとしないでください。

Answer 2

これは動作します：

theRegex=Regexp.new("("+(Regexp.union(str.split(' ')).inspect.chop[1..-1])+"){#{str.split(' ').length}}") 

生成された正規表現は/(ruby|web|development){3}/です。これは、あなたの望むことですか？ただ、正規表現を使用すると、この目標への最速のパスではないことを指摘する