Php 正则表达式导致重复，为什么？

我试图捕获@font-face中的所有URL，但$matches会创建重复的URL，而它不应该这样做。我真的不明白为什么会这样。我用创建了正则表达式，它工作得很好，但当我自己将它放在php文档中时，它就不工作了。非常感谢您的帮助！ 如果有帮助的话，我的php版本是7.1

<?php
$re = '/url\s*\(\s*[\'"]?(?!(((?:https?:)?\/\/)|(?:data\:?:)))([^\'"\)]+)[\'"]?\s*\)/';
$str = '@font-face{font-family:Poiret One;font-style:normal;font-weight:400;src:local(\'PoiretOne-Regular\'),url(/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff2) format(\'woff2\'),url(/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff) format(\'woff\'),url(/wp-content/themes/Divi-Child/fonts/PoiretOne-Regular.ttf) format(\'truetype\')}@font-face{font-family:Open sans;font-style:normal;font-weight:400;src:local(\'OpenSans-Regular\'),url(/wp-content/themes/Divi-Child/fonts/opensans-regular-webfont_webfont.woff2) format(\'woff2\'),url(/wp-content/themes/Divi-Child/fonts/opensans-regular-webfont_webfont.woff) format(\'woff\'),url(/wp-content/themes/Divi-Child/fonts/OpenSans-Regular.ttf) format(\'truetype\')}@font-face{font-family:Open sans;font-weight:300;src:local(\'OpenSans-Light\'),url(/wp-content/themes/Divi-Child/fonts/opensans-light-webfont_webfont.woff2) format(\'woff2\'),url(/wp-content/themes/Divi-Child/fonts/opensans-light-webfont_webfont.woff) format(\'woff\'),url(/wp-content/themes/Divi-Child/fonts/OpenSans-Light.ttf) format(\'truetype\')}@font-face{font-family:Dancing Script;font-weight:400;font-style:normal;src:local(\'dancing-script_regular\'),url(/wp-content/themes/Divi-Child/fonts/dancingscript-regular_webfont.woff2) format(\'woff2\'),url(/wp-content/themes/Divi-Child/fonts/dancingscript-regular_webfont.woff) format(\'woff\'),url(/wp-content/themes/Divi-Child/fonts/dancing-script_regular_webfont.ttf) format(\'truetype\')}@font-face{font-family:Josefin Slab;font-weight:400;font-style:normal;src:local(\'JosefinSlab-Regular\'),url(/wp-content/themes/Divi-Child/fonts/josefinslab-regular_webfont.woff2) format(\'woff2\'),url(/wp-content/themes/Divi-Child/fonts/josefinslab-regular_webfont.woff) format(\'woff\'),url(/wp-content/themes/Divi-Child/fonts/JosefinSlab-Regular.ttf) format(\'truetype\')}@font-face{font-family:Josefin Slab;font-weight:400;font-style:italic;src:local(\'JosefinSlab-Italic\'),url(/wp-content/themes/Divi-Child/fonts/josefinslab-italic_webfont.woff2) format(\'woff2\'),url(/wp-content/themes/Divi-Child/fonts/josefinslab-italic_webfont.woff) format(\'woff\'),url(/wp-content/themes/Divi-Child/fonts/JosefinSlab-Italic.ttf) format(\'truetype\')}';

preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);

// Print the entire match result
print_r($matches);

我刚刚运行了你的代码

我得到了一个由18个元素组成的数组

Ctrl+F返回两个“divi-child”实例的原因是，它出现在完整内容匹配中，以及用括号指定的较小匹配中

array (size=18)
  0 => 
    array (size=4)
      0 => string 'url(/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff2)' (length=72)
      1 => string '' (length=0)
      2 => string '' (length=0)
      3 => string '/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff2' (length=67)
  1 => 
    array (size=4)
      0 => string 'url(/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff)' (length=71)
      1 => string '' (length=0)
      2 => string '' (length=0)
      3 => string '/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff' (length=66)
<snip>

array (size=2)
  0 => 
    array (size=18)
      0 => string 'url(/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff2)' (length=72)
      1 => string 'url(/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff)' (length=71)
      2 => string 'url(/wp-content/themes/Divi-Child/fonts/PoiretOne-Regular.ttf)' (length=62)
      3 => string 'url(/wp-content/themes/Divi-Child/fonts/opensans-regular-webfont_webfont.woff2)' (length=79)
      <snip>
  1 => 
    array (size=18)
      0 => string '/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff2' (length=67)
      1 => string '/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff' (length=66)
      2 => string '/wp-content/themes/Divi-Child/fonts/PoiretOne-Regular.ttf' (length=57)
      3 => string '/wp-content/themes/Divi-Child/fonts/opensans-regular-webfont_webfont.woff2' (length=74)
      <snip>

将发送到

preg\u match\u all（）

函数的参数更改为

preg_match_all($re, $str, $matches);

返回的值将是一个包含两个元素的数组（每个数组本身）。第一个元素是和正则表达式完全匹配的数组。第二个元素是我们用括号捕获的匹配部分

array (size=18)
  0 => 
    array (size=4)
      0 => string 'url(/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff2)' (length=72)
      1 => string '' (length=0)
      2 => string '' (length=0)
      3 => string '/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff2' (length=67)
  1 => 
    array (size=4)
      0 => string 'url(/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff)' (length=71)
      1 => string '' (length=0)
      2 => string '' (length=0)
      3 => string '/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff' (length=66)
<snip>

array (size=2)
  0 => 
    array (size=18)
      0 => string 'url(/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff2)' (length=72)
      1 => string 'url(/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff)' (length=71)
      2 => string 'url(/wp-content/themes/Divi-Child/fonts/PoiretOne-Regular.ttf)' (length=62)
      3 => string 'url(/wp-content/themes/Divi-Child/fonts/opensans-regular-webfont_webfont.woff2)' (length=79)
      <snip>
  1 => 
    array (size=18)
      0 => string '/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff2' (length=67)
      1 => string '/wp-content/themes/Divi-Child/fonts/poiretone-regular_webfont.woff' (length=66)
      2 => string '/wp-content/themes/Divi-Child/fonts/PoiretOne-Regular.ttf' (length=57)
      3 => string '/wp-content/themes/Divi-Child/fonts/opensans-regular-webfont_webfont.woff2' (length=74)
      <snip>

数组（大小=2）
0 => 
阵列（大小=18）
0=>string'url（/wp content/themes/Divi Child/font/poiretone-regular_webfont.woff2）'（长度=72）
1=>string'url（/wp content/themes/Divi Child/font/poiretone-regular_webfont.woff）'（长度=71）
2=>string'url（/wp-content/themes/Divi-Child/fonts/PoiretOne-Regular.ttf）'（长度=62）
3=>string'url（/wp-content/themes/Divi-Child/font/opensans-regular-webfont_-webfont.woff2）'（长度=79）
1 => 
阵列（大小=18）
0=>string'/wp content/themes/Divi Child/font/poiretone-regular_webfont.woff2'（长度=67）
1=>string'/wp content/themes/Divi Child/font/poiretone-regular_webfont.woff'（长度=66）
2=>string'/wp content/themes/Divi Child/font/PoiretOne Regular.ttf'（长度=57）
3=>string'/wp content/themes/Divi Child/font/opensans-regular-webfont_webfont.woff2'（长度=74）

你好，卢克，谢谢你帮助我！我们如何才能只捕获较小的匹配项，这样我们就只有一个实例？使用非贪婪的量词，如

*？

，而不是贪婪的量词，如

[^”]

+

等。请查看我的答案-我已经扩展了它，为您提供了一个可能的解决方案，@skillybastarddit在中解释并做了相同的操作：

$matches[0]

包含与整个

regex

相匹配的子字符串，从

$matches[1]

开始，有一些子字符串与

regex

中的当前值相匹配。如果查看

元素中的

print\r（$matches）

的输出（或者根本没有嵌入HTML），您可以很容易地发现这一点谢谢@axiac我把这个和卢克的答案一起用了！