Question

我想通过一些正则表达式来分割句子但我无法完全按照我的想象得到结果。

pattern = /[!.\\n]+[^.\d*]/
str = 'immediate! availability. of PHP 5.3.29.a';
preg_split($pattern,$str);

结果看起来像这样

    array (
       0 => 'immediate',
       1 => 'availability',
       2 => 'of PHP 5.3.29',
       3 => '',
    )

但我希望结果看起来像这样..

 array (
     0 => 'immediate!',
     1 => 'availability.',
     2 => 'of PHP 5.3.29.',
     3 => 'a',
 )

我怎样才能做到这一点？

Answer 1

根据前面有!或.符号或单词边界的空格进行拆分，后跟一个小写字母后跟一个单词边界。

<?php
$yourstring = "immediate! availability. of PHP 5.3.29.a";
$regex = '~(?<=[!.]) |\b(?=[a-z]\b)~';
$splits = preg_split($regex, $yourstring);
print_r($splits);
?>

<强>输出：

Array
(
    [0] => immediate!
    [1] => availability.
    [2] => of PHP 5.3.29.
    [3] => a
)

Answer 2

您也可以尝试使用Lookaround

(?<=\.|!) *(?=\D)

Online demo

模式说明：

  (?<=                     look behind to see if there is:
    \.                       '.'
   |                        OR
    !                        '!'
  )                        end of look-behind
   *                       ' ' (0 or more times)
  (?=                      look ahead to see if there is:
    \D                       non-digits (all but 0-9)
  )                        end of look-ahead

正则表达式 - php preg_split结果

2 个答案: