从TAG格式创建更复杂的正则表达式 [英] Creating more complex regexes from TAG format

问题描述

所以我无法在这里弄清楚我的正则表达式有什么问题。 （原始对话包含对这些TAG格式的说明，可以在以下位置找到：从TAG格式转换为语料库的正则表达式）。

So I can't figure out what's wrong with my regex here. (The original conversation, which includes an explanation of these TAG formats, can be found here: Translate from TAG format to Regex for Corpus).

我以这样的字符串开头：

I am starting with a string like this:

Arms_NNSfolded_VVN，_ ，

Arms_NNS folded_VVN ,_,

NNS也可以是NN，而VVN也可以是VBG。而且我只想查找具有相同标签的字符串以及其他字符串（NNS或NN后跟b VVN或VBG，后跟逗号）。

The NNS could also NN, and the VVN could also be VBG. And I just want to find that and other strings with the same tags (NNS or NN followed b VVN or VBG followed by comma).

以下正则表达式是我的意思尝试使用，但找不到任何东西：

The following regex is what I am trying to use, but it is not finding anything:

[\w-]+_(?:NN|NNS)\W+[\w-]+ _(?:VBG|VVN)\W+[\w-]+ _,

推荐答案

给出输入字符串

Arms_NNS folded_VVN ,_,

以下正则表达式

(\w+_(?:NN|NNS) \w+_(?:VBG|VVN) ,_,)

匹配整个字符串（并捕获它-如果您不知道那是什么意思，那可能意味着它对您来说没有关系）。

matches the whole string (and captures it - if you don't know what that means, that probably means it doesn't matter to you).

给出一个更长的字符串（由我组成）

Given a longer string (which I made up)

Dog_NN Arms_NNS folded_VVN ,_, burp_VV

它仍然与您想要的部分匹配。

it still matches the part you want.

如果_VVN部分是可选的，则可以使用

If the _VVN part is optional, you can use

(\w+_(?:NN|NNS) (?:\w+_(?:VBG|VVN) )?,_,)

要么匹配，要么匹配word_VVN / word_VBG部分。

which matches either witout, or with exactly one, word_VVN / word_VBG part.

您的一般性问题：

我很难解释这些问题的工作原理。我将尝试解释组成部分：

I find it hard to explain how these things work. I'll try to explain the constituent parts:

• \w匹配单词字符-通常希望在单词中找到的字符


• \w *匹配一个或多个


• （NN | NNS）表示匹配NN或NNS


• ?：表示匹配但不捕获-建议使用谷歌搜索与正则表达式相关的捕获方法。


• ？单独的意思是匹配我之前的事物的0或1-所以x？会匹配或 x，但不匹配 xx。


• ，_中的所有字符都不是

• \w matches word characters - characters you'd normally expect to find in words
• \w* matches one-or-more of them
• (NN|NNS) means "match NN or NNS"
• ?: means "match but don't capture" - suggest googling what capturing means in relation to regexes.
• ? alone means "match 0 or 1 of the thing before me - so x? would match "" or "x" but not "xx".
• None of the characters in ,_, are special, so we can match them just by putting them in the regex.

您的正则表达式的一个问题是\w不会

One problem with your regex is that \w will not match a comma (only "word characters").

我不知道[\w-]的作用。看起来有点奇怪。我认为可能不有效，但我不确定。

I don't know what [\w-] does. Looks a bit weird. I think it's probably not valid, but I don't know for sure.

我的解决方案假定您标记的单词之间只有一个空格，而没有其他内容。

My solution assumes there is exactly one space, and nothing else, between your tagged words.

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