使用也处理撇号的正则表达式匹配单词 [英] Match a word using regex that also handles apostrophes

问题描述

我必须将一行文本分成单词，并且对使用什么正则表达式感到困惑.我到处寻找与单词匹配的正则表达式，并找到了与这篇文章类似的正则表达式，但希望在 Java 中使用它(Java 不处理常规字符串中的 \).

I have to separate a line of text into words, and am confused on what regex to use. I have looked everywhere for a regex that matches a word and found ones similar to this post but want it in java (java doesn't handle \ in regular strings).

正则表达式匹配单词和带撇号的单词

我已经为每个答案尝试了正则表达式，但不确定如何为此构造 java 正则表达式(我假设所有正则表达式都相同).如果在我看到的正则表达式中用 \ 替换 \，则正则表达式不起作用.

I have tried the regex for each answer and am unsure of how to structure a regex for java for this (i assumed all regex were the same). If replace \ by \ in the regex i see, the regex doesn't work.

我也尝试过自己查找并来到此页面:http://www.regular-expressions.info/reference.html

I have also tried looking it up myself and have come to this page: http://www.regular-expressions.info/reference.html

但我无法理解正则表达式高级技术.

But I cannot wrap my head around regex advanced techniques.

我使用 String.split(regex string here) 来分隔我的字符串.一个例子是，如果我得到以下内容:我喜欢吃，但我不喜欢吃每个人的食物，否则他们会饿死."我要匹配:

I am using String.split(regex string here) to separate my string. an example is if I'm given the following: "I like to eat but I don't like to eat everyone's food, or they'll starve." I want to match:

I
like
to
eat
but
I
don't
like
to
eat
everyone's
food
or
they'll
starve

我也不想匹配 '' 或 '''' 或 ' ' 或 '.'' 或其他排列.我的分隔符条件应该类似于:[匹配任意单词字符][如果前面有单词字符也匹配撇号，如果有的话匹配后面的单词字符]

I also don't want to match '' or '''' or ' ' or '.'' or other permutations. My delimiter conditions should be similar to: [match any word character][also match an apostrophe if it is preceded by a word character and then match word characters after it if there are any]

我得到的只是一个匹配单词 [\w] 的简单正则表达式，但我不确定如何使用向前看或向后看来匹配撇号和剩余的单词.

What i got is just a simple regex that matches words [\w], but i am unsure of how to use lookahead or look behind to match the apostrophe and then the remaining words.

推荐答案

在我的评论中所述的页面上使用 WhirlWind 的答案，您可以执行以下操作:

Using answer from WhirlWind on the page stated in my comment you can do the following:

String candidate = "I \n"+
    "like \n"+
    "to "+
    "eat "+
    "but "+
    "I "+
    "don't "+
    "like "+
    "to "+
    "eat "+
    "everyone's "+
    "food "+
    "''  ''''  '.' ' "+
    "or "+
    "they'll "+
    "starv'e'";

String regex = "('\\w+)|(\\w+'\\w+)|(\\w+')|(\\w+)";
Matcher matcher = Pattern.compile(regex).matcher(candidate);
while (matcher.find()) {
  System.out.println("> matched: `" + matcher.group() + "`");
}

它会打印:

> matched: `I`
> matched: `like`
> matched: `to`
> matched: `eat`
> matched: `but`
> matched: `I`
> matched: `don't`
> matched: `like`
> matched: `to`
> matched: `eat`
> matched: `everyone's`
> matched: `food`
> matched: `or`
> matched: `they'll`
> matched: `starv'e`

您可以在此处找到运行示例:http://ideone.com/pVOmSK

You can find a running example here: http://ideone.com/pVOmSK

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