如何将句子分为单词和标点符号? [英] How can I split a sentence into words and punctuation marks?

问题描述

例如，我想分割这句话:

For example, I want to split this sentence:

I am a sentence.

分成5个部分组成的数组； I，am，a，sentence和..

Into an array with 5 parts; I, am, a, sentence, and ..

尝试使用explode后，我目前正在使用preg_split，但似乎找不到合适的东西.

I'm currently using preg_split after trying explode, but I can't seem to find something suitable.

这是我尝试过的:

$sentence = explode(" ", $sentence);
/*
returns array(4) {
  [0]=>
  string(1) "I"
  [1]=>
  string(2) "am"
  [2]=>
  string(1) "a"
  [3]=>
  string(8) "sentence."
}
*/

还有这个:

$sentence = preg_split("/[.?!\s]/", $sentence);
/*
returns array(5) {
  [0]=>
  string(1) "I"
  [1]=>
  string(2) "am"
  [2]=>
  string(1) "a"
  [3]=>
  string(8) "sentence"
  [4]=>
  string(0) ""
}
*/

这怎么办?

推荐答案

您可以在单词边界处拆分:

You can split on word boundaries:

$sentence = preg_split("/(?<=\w)\b\s*/", 'I am a sentence.');

几乎进行正则表达式扫描，直到找到单词字符为止，然后，正则表达式必须捕获单词边界和一些可选的空格.

Pretty much the regex scans until a word character is found, then after it, the regex must capture a word boundary and some optional space.

输出:

array(5) {
  [0]=>
  string(1) "I"
  [1]=>
  string(2) "am"
  [2]=>
  string(1) "a"
  [3]=>
  string(8) "sentence"
  [4]=>
  string(1) "."
}

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