使用preg_match_all从字符串中提取单词 [英] Extract words from string with preg_match_all

问题描述

我对正则表达式不好，但是我想用它从字符串中提取单词.

I'm not good with regex but i want to use it to extract words from a string.

我需要的单词至少应包含4个字符，并且提供的字符串可以是utf8.

示例字符串:

外在的苏萨azahares presentan gruesospétalosblancosteñidosde rosa，con numerosos estambres(20-40).

Sus azahares presentan gruesos pétalos blancos teñidos de rosa o violáceo en la parte externa, con numerosos estambres (20-40).

所需的输出:

Array(
    [0] => azahares
    [1] => presentan
    [2] => gruesos
    [3] => pétalos
    [4] => blancos
    [5] => teñidos
    [6] => rosa
    [7] => violáceo
    [8] => parte
    [9] => externa
    [10] => numerosos
    [11] => estambres
)

推荐答案

如果要查找的单词是UTF-8(根据规范，至少长4个字符)，且由ISO-8859-的字母字符组成，则此方法有效15(适用于西班牙语，也适用于英语，德语，法语等):

This works if the words to look for are UTF-8 (at least 4 chars long, as per specs), consisting of alphabetic characters of ISO-8859-15 (which is fine for Spanish, but also for English, German, French, etc.):

$n_words = preg_match_all('/([a-zA-Z]|\xC3[\x80-\x96\x98-\xB6\xB8-\xBF]|\xC5[\x92\x93\xA0\xA1\xB8\xBD\xBE]){4,}/', $str, $match_arr);
$word_arr = $match_arr[0];

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