preg_match ( string pattern, string subject [, array matches [, int flags]])
在 subject 字符串中搜索与 pattern 给出的正则表达式相匹配的内容。
如果提供了 matches,则其会被搜索的结果所填充。 $matches[0] 将包含与整个模式匹配的文本,$matches[1] 将包含与第一个捕获的括号中的子模式所匹配的文本,以此类推。
菜鸟求问,这个函数不是只能匹配到最多一个符合的目标吗,matchs【0】和matchs【1】分别包含了啥,看不懂这句话
回复讨论(解决方案)
$s = 'func(123,456,789)';preg_match('/,?(\d+)/', $s, $m);print_r($m);preg_match_all('/,?(\d+)/', $s, $m);print_r($m);
Array( [0] => 123 [1] => 123)Array( [0] => Array ( [0] => 123 [1] => ,456 [2] => ,789 ) [1] => Array ( [0] => 123 [1] => 456 [2] => 789 ))
看不懂就动手做做
计算机科学是实验型科学,只动眼不动手 是不行的
不明白就打印出来出来看看。
$matches[1] 将包含与第一个捕获的括号中的子模式所匹配的文本,以此类推。
这里说的第一个括号中的子模式 指的是\d+ 吗 ,是的话就看明白了。抱歉 我不是不想自己打,我在百度搜到输出结果了,但是有点困惑
( 子模式开始
) 子模式结束
手册是一定要看的!
匹配多个使用 preg_match_all
$matches[0] 将包含与整个模式匹配的文本,$matches[1] 将包含与第一个捕获的括号中的子模式所匹配的文本,以此类推。
$matches[0] 会把边界的也保存
$matches[1] 只保留正则匹配的
例如
$content = '<img src="/static/imghwm/default1.png" data-src="http://www.csdn.net/abc.jpg" class="lazy" alt="php preg_match" >';preg_match_all('/<img .*?src=\"(http:\/\/.+\.(jpg|jpeg|gif|bmp|png))\" alt="php preg_match" >/i', $content, $matches); print_r($matches[0]);print_r($matches[1]);
Array
(
[0] =>

)
Array
(
[0] => http://www.csdn.net/abc.jpg
)
$matches[0] 将包含与整个模式匹配的文本,$matches[1] 将包含与第一个捕获的括号中的子模式所匹配的文本,以此类推。
$matches[0] 会把边界的也保存
$matches[1] 只保留正则匹配的
例如
$content = '<img src="/static/imghwm/default1.png" data-src="http://www.csdn.net/abc.jpg" class="lazy" alt="php preg_match" >';preg_match_all('/<img .*?src=\"(http:\/\/.+\.(jpg|jpeg|gif|bmp|png))\" alt="php preg_match" >/i', $content, $matches); print_r($matches[0]);print_r($matches[1]);
Array
(
[0] =>

)
Array
(
[0] => http://www.csdn.net/abc.jpg
)
第一个括号中的模式 我懂了。match【1】 输出的刚好是括号里面对应的模式
以后碰到同类问题都可以先打印一下看看

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