Space 被 preg_split 删除

Question

我想用一个点和一个 space 来分割字符串。但是，preg_split 从匹配的部分中删除了 space。

如何保留 space？

preg_split('/(?<=[.])\s+/u', 'One. Two. Three.', null, PREG_SPLIT_NO_EMPTY);

// Result: ['One.', 'Two.', 'Three.']
// Expected: ['One. ', 'Two. ', 'Three.']

Answer 1

您可以将正先行转换为匹配，然后使用 \K 忘记匹配的内容。此外，要匹配一个或多个空格，请使用 \s+.

\.\s+\K

Regex demo

var_dump(preg_split('/\.\s+\K/', 'One. Two. Three.', null, PREG_SPLIT_NO_EMPTY));

结果

array(3) {
  [0]=>
  string(5) "One. "
  [1]=>
  string(5) "Two. "
  [2]=>
  string(6) "Three."
}

Answer 2

您可以使用 preg_match_all 并匹配任何点和可选的 space

preg_match_all("/(.*?\.\s*)/", 'One. Two. Three.',$m);

结果：

array(2) {
  [0]=>
  array(3) {
    [0]=>
    string(5) "One. "
    [1]=>
    string(5) "Two. "
    [2]=>
    string(6) "Three."
  }
  [1]=>
  array(3) {
    [0]=>
    string(5) "One. "
    [1]=>
    string(5) "Two. "
    [2]=>
    string(6) "Three."
  }
}

https://3v4l.org/ZFV9t

Answer 3

按照您的预期结果。

$string = 'One. Two. Three.';

$split = preg_split("/(\w+\W+)/", $string, -1, PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY);
var_dump($split);

Space 被 preg_split 删除

Space removed by preg_split

php

regex

preg-split