需要正则表达式匹配一行中单词的反向
示例输入字符串：result = [];
add = hour + hours - (length / 2) - (length % 2) + 1;
for (i = 0; i < length; i++) {
result[(add + i) % length] = (add + i) % hours;
}
用户输入的字符串：function getColorIndexes(hour, hours, length) {
var i, result, add;
if (hours % length) throw "number of hours must be multiple of length";
result = [];
add = hour + hours - (length / 2) - (length % 2) + 1;
for (i = 0; i < length; i++) {
result[(add + i) % length] = (add + i) % hours;
}
return result;
}
console.log ('hour=3: ' + getColorIndexes(3, 24, 12));
console.log ('hour=5: ' + getColorIndexes(5, 24, 12));
console.log ('hour=9: ' + getColorIndexes(9, 24, 12));
console.log ('hour=23: ' + getColorIndexes(23, 24, 12));
在上面的两个字符串中，我需要逐字解析输入字符串和User键入的字符串，并且需要在用户键入的字符串中找到匹配项。如果
- 输入字符串中的常规字符应与ralugeR匹配。
- 应与si 匹配
- 真的应该与yllear相匹配
- 应与ot 匹配
注意：输入字符串不是常量字符串，它可能会有所不同。 例如：
另一个示例字符串可以是：Regular Expression is really Tough to understand。
用户输入：ralugeR Expression si yllear Tough ot understand。
我正在寻找一个正则表达式来匹配行中单词的反向。但输入单词可能是可更改的。
但输入字符串将包含大写和小写的任何字母，以及其中的数字。
1 个答案:
答案 0 :(得分：2)
Foreward
使用正则表达式并不适合这类工作。这里可以遇到很多边缘情况。
描述
\b([^\s])([^\s])(?:([^\s])(?:([^\s])(?:([^\s])(?:([^\s])(?:([^\s])(?:([^\s])(?:([^\s]))?)?)?)?)?)?)?\b(?=.*?\n.*?\b((?:(?:(?:(?:(?:(?:(?:\9)?\8)?\7)?\6)?\5)?\4)?\3)?\2\1)\b)
注意：要更好地查看图像，请右键单击图像，然后在新窗口中选择视图。
摘要
此正则表达式将执行以下操作：
- 假设输入字符串由以下两行由新行字符分隔组成
- 输入字符串
- 用户创建的字符串
- 假设单词最多只能包含9个字符
- 假设最小的单词长度为2个字符，因为后面拼写的
a仍然是a但不是真的倒退。 - 不验证或匹配单词位置，换句话说，向后拼写的单词可以出现在第二行的任何单词位置。
- 将第一行中的单词与第二行进行比较，其中第二行中的单词必须向后拼写以匹配
- 捕获组0将从第一行获取单词
- 捕获组1-9将始终具有单独的字母
- 捕获组10将从第二行获得向后的单词
实施例
现场演示
https://regex101.com/r/zO4yI1/4
示例文字
我不确定yllear是否在原始问题中故意拼错，但我在示例中添加了另外一个错误拼写的raelly
Regular Expression is really raelly Tough to understand
ralugeR Expression si yllear Tough ot understand
样本匹配
MATCH 1
1. [0-1] `R`
2. [1-2] `e`
3. [2-3] `g`
4. [3-4] `u`
5. [4-5] `l`
6. [5-6] `a`
7. [6-7] `r`
10. [56-63] `ralugeR`
MATCH 2
1. [19-20] `i`
2. [20-21] `s`
10. [75-77] `si`
MATCH 3
1. [29-30] `r`
2. [30-31] `a`
3. [31-32] `e`
4. [32-33] `l`
5. [33-34] `l`
6. [34-35] `y`
10. [78-84] `yllear`
MATCH 4
1. [42-43] `t`
2. [43-44] `o`
10. [91-93] `ot`
解释
NODE EXPLANATION
----------------------------------------------------------------------
\b the boundary between a word char (\w) and
something that is not a word char
----------------------------------------------------------------------
( group and capture to \1:
----------------------------------------------------------------------
[^\s] any character except: whitespace (\n,
\r, \t, \f, and " ")
----------------------------------------------------------------------
) end of \1
----------------------------------------------------------------------
( group and capture to \2:
----------------------------------------------------------------------
[^\s] any character except: whitespace (\n,
\r, \t, \f, and " ")
----------------------------------------------------------------------
) end of \2
----------------------------------------------------------------------
(?: group, but do not capture (optional
(matching the most amount possible)):
----------------------------------------------------------------------
( group and capture to \3:
----------------------------------------------------------------------
[^\s] any character except: whitespace (\n,
\r, \t, \f, and " ")
----------------------------------------------------------------------
) end of \3
----------------------------------------------------------------------
(?: group, but do not capture (optional
(matching the most amount possible)):
----------------------------------------------------------------------
( group and capture to \4:
----------------------------------------------------------------------
[^\s] any character except: whitespace
(\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
) end of \4
----------------------------------------------------------------------
(?: group, but do not capture (optional
(matching the most amount possible)):
----------------------------------------------------------------------
( group and capture to \5:
----------------------------------------------------------------------
[^\s] any character except: whitespace
(\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
) end of \5
----------------------------------------------------------------------
(?: group, but do not capture (optional
(matching the most amount
possible)):
----------------------------------------------------------------------
( group and capture to \6:
----------------------------------------------------------------------
[^\s] any character except: whitespace
(\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
) end of \6
----------------------------------------------------------------------
(?: group, but do not capture
(optional (matching the most
amount possible)):
----------------------------------------------------------------------
( group and capture to \7:
----------------------------------------------------------------------
[^\s] any character except:
whitespace (\n, \r, \t, \f,
and " ")
----------------------------------------------------------------------
) end of \7
----------------------------------------------------------------------
(?: group, but do not capture
(optional (matching the most
amount possible)):
----------------------------------------------------------------------
( group and capture to \8:
----------------------------------------------------------------------
[^\s] any character except:
whitespace (\n, \r, \t, \f,
and " ")
----------------------------------------------------------------------
) end of \8
----------------------------------------------------------------------
(?: group, but do not capture
(optional (matching the most
amount possible)):
----------------------------------------------------------------------
( group and capture to \9:
----------------------------------------------------------------------
[^\s any character except:
] whitespace (\n, \r, \t,
\f, and " ")
----------------------------------------------------------------------
) end of \9
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
\b the boundary between a word char (\w) and
something that is not a word char
----------------------------------------------------------------------
(?= look ahead to see if there is:
----------------------------------------------------------------------
.*? any character except \n (0 or more times
(matching the least amount possible))
----------------------------------------------------------------------
\n '\n' (newline)
----------------------------------------------------------------------
.*? any character except \n (0 or more times
(matching the least amount possible))
----------------------------------------------------------------------
\b the boundary between a word char (\w)
and something that is not a word char
----------------------------------------------------------------------
( group and capture to \10:
----------------------------------------------------------------------
(?: group, but do not capture (optional
(matching the most amount possible)):
----------------------------------------------------------------------
(?: group, but do not capture (optional
(matching the most amount
possible)):
----------------------------------------------------------------------
(?: group, but do not capture
(optional (matching the most
amount possible)):
----------------------------------------------------------------------
(?: group, but do not capture
(optional (matching the most
amount possible)):
----------------------------------------------------------------------
(?: group, but do not capture
(optional (matching the most
amount possible)):
----------------------------------------------------------------------
(?: group, but do not capture
(optional (matching the most
amount possible)):
----------------------------------------------------------------------
(?: group, but do not capture
(optional (matching the
most amount possible)):
----------------------------------------------------------------------
\9 what was matched by
capture \9
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
\8 what was matched by
capture \8
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
\7 what was matched by capture
\7
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
\6 what was matched by capture \6
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
\5 what was matched by capture \5
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
\4 what was matched by capture \4
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
\3 what was matched by capture \3
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
\2 what was matched by capture \2
----------------------------------------------------------------------
\1 what was matched by capture \1
----------------------------------------------------------------------
) end of \10
----------------------------------------------------------------------
\b the boundary between a word char (\w)
and something that is not a word char
----------------------------------------------------------------------
) end of look-ahead
----------------------------------------------------------------------
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