使用这种模式:
(how is\s)?(the\s)?(weather)\s?((on)\s)?(today|tomorrow|sunday|monday|tuesday|wednesday|thursday|friday|saturday|sunday|this week)?(\s(in)\s(.*)\s?(on)?\s?(today|tomorrow|sunday|monday|tuesday|wednesday|thursday|friday|saturday|sunday|this week)?)?
这就是我要捕捉的东西
输入:维也纳星期二的天气怎么样
输出:
array(10
0 => how is the weather on tuesday in vienna
1 => how is
2 => the
3 => weather
4 => on
5 => on
6 => tuesday
7 => in vienna
8 => in
9 => vienna
)
在这里，我可以从 array[6] 和 array[9] 中提取日期和位置
输入:周二维也纳的天气怎么样
输出:
array(10
0 => how is the weather in vienna on tuesday
1 => how is
2 => the
3 => weather
4 =>
5 =>
6 =>
7 => in vienna on tuesday
8 => in
9 => vienna on tuesday
)
但在这里，地点和日期被作为一个整体捕获在array[9] 中。我希望它以不同的元素捕捉日期和位置。正则表达式模式中的分组有什么问题吗？
最佳答案
我建议使用可选的先行搜索来查找位置或时间范围(如果存在)。
^(?=(?:.*?on\s(今天|明天|星期日|星期一|星期二|星期三|星期四|星期五|星期六|星期日|本周))?)(?=( ?:.*?in\s([a-z]+))?)
此正则表达式将执行以下操作:
现场演示
https://regex101.com/r/rN9hG2/1
示例文本
weather on sunday
weather on sunday in vienna
weather in vienna
weather in vienna on sunday
样本匹配
[0][1] = sunday
[0][2] =
[1][1] = sunday
[1][2] = vienna
[2][1] =
[2][2] = vienna
[3][1] = sunday
[3][2] = vienna
NODE EXPLANATION
----------------------------------------------------------------------
(?= look ahead to see if there is:
----------------------------------------------------------------------
(?: group, but do not capture (optional
(matching the most amount possible)):
----------------------------------------------------------------------
.*? any character except \n (0 or more
times (matching the least amount
possible))
----------------------------------------------------------------------
on 'on'
----------------------------------------------------------------------
\s whitespace (\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
( group and capture to \1:
----------------------------------------------------------------------
today 'today'
----------------------------------------------------------------------
| OR
----------------------------------------------------------------------
tomorrow 'tomorrow'
----------------------------------------------------------------------
| OR
----------------------------------------------------------------------
sunday 'sunday'
----------------------------------------------------------------------
| OR
----------------------------------------------------------------------
monday 'monday'
----------------------------------------------------------------------
| OR
----------------------------------------------------------------------
tuesday 'tuesday'
----------------------------------------------------------------------
| OR
----------------------------------------------------------------------
wednesday 'wednesday'
----------------------------------------------------------------------
| OR
----------------------------------------------------------------------
thursday 'thursday'
----------------------------------------------------------------------
| OR
----------------------------------------------------------------------
friday 'friday'
----------------------------------------------------------------------
| OR
----------------------------------------------------------------------
saturday 'saturday'
----------------------------------------------------------------------
| OR
----------------------------------------------------------------------
sunday 'sunday'
----------------------------------------------------------------------
| OR
----------------------------------------------------------------------
this week 'this week'
----------------------------------------------------------------------
) end of \1
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
) end of look-ahead
----------------------------------------------------------------------
(?= look ahead to see if there is:
----------------------------------------------------------------------
(?: group, but do not capture (optional
(matching the most amount possible)):
----------------------------------------------------------------------
.*? any character except \n (0 or more
times (matching the least amount
possible))
----------------------------------------------------------------------
in 'in'
----------------------------------------------------------------------
\s whitespace (\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
( group and capture to \2:
----------------------------------------------------------------------
[a-z]+ any character of: 'a' to 'z' (1 or
more times (matching the most amount
possible))
----------------------------------------------------------------------
) end of \2
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
) end of look-ahead
----------------------------------------------------------------------
关于php - 正则表达式(php 中的 preg_match): last groups in the output array don't work correctly，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37516761/
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