如何用正則表達式選擇特定數量的字符單詞

我有一個像下面的文字。如何用正則表達式選擇特定數量的字符單詞

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這就是我需要的正則表達式：

1-選擇五個字符的單詞。

2-在第一步之後選擇一個空格。

3-在第二步之後選擇七個字符。

它應該捕獲所有的fivec harword字符串。我怎樣才能做到這一點？

來源

2013-03-22 Imrahil

使用這一個：

\b\w{5}\s\w{7}\b

解釋：

The regular expression: 

(?-imsx:\b\w{5}\s\w{7}\b) 

matches as follows: 

NODE      EXPLANATION 
---------------------------------------------------------------------- 
(?-imsx:     group, but do not capture (case-sensitive) 
         (with^and $ matching normally) (with . not 
         matching \n) (matching whitespace and # 
         normally): 
---------------------------------------------------------------------- 
    \b      the boundary between a word char (\w) and 
          something that is not a word char 
---------------------------------------------------------------------- 
    \w{5}     word characters (a-z, A-Z, 0-9, _) (5 
          times) 
---------------------------------------------------------------------- 
    \s      whitespace (\n, \r, \t, \f, and " ") 
---------------------------------------------------------------------- 
    \w{7}     word characters (a-z, A-Z, 0-9, _) (7 
          times) 
---------------------------------------------------------------------- 
    \b      the boundary between a word char (\w) and 
          something that is not a word char 
---------------------------------------------------------------------- 
)      end of grouping 
----------------------------------------------------------------------

來源

2013-03-22 11:09:20 Toto

感謝它的作品，我的預期。 – Imrahil 2013-03-22 11:15:35

@Ihrahil：不客氣。 – Toto 2013-03-22 11:18:46

+1對於一個不好的問題很好的答案 – 2014-09-08 19:00:07

這應該做的伎倆

(^|\W)\w{5}\s\w{7}($|\W)

(^|\W)開始的字符串或一個非文字字符的。

\w{5}的5個字字符

\s一個空格的字符串

\w{7}的7個單詞字符

字符串或一個非文字字符

如果的

($|\W)端串特別要在字符串周圍留出空格（而不是標點符號等）將\W替換爲\s

來源

2013-03-22 11:06:12

這將不匹配在開始時或在字符串的末尾。 – Toto 2013-03-22 11:11:29

爲什麼這個不起作用？我添加了5個字符的正則表達式結束。 '\ W \ w {5} \ s \ w {7} \ s \ w {5} \ W'我試着用適當的文字來嘗試。 – Imrahil 2013-03-22 11:14:07

M42是正確的，我已經調整過我的字符串開頭和結尾（如果需要，仍然允許靈活地匹配空格） – 2013-03-22 11:15:44

試試這個

\b[a-zA-Z]{5}\s[][a-zA-Z]{7}\b

\ b表示邊界

[A-ZA-Z]所有的α投注

{5} 5個字符與先前表達

\ S單個空格

來源

2013-03-22 11:15:44 Civa

如何用正則表達式選擇特定數量的字符單詞

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