php利用正則獲取指定位置內(nèi)容
Jun 08, 2016 pm 05:26 PM我們經(jīng)常會(huì)碰以要獲取一個(gè)字符串指定部份的內(nèi)容,下面我們用正則匹配來(lái)獲取下一頁(yè)的url怎么樣。
?代碼如下 | 復(fù)制代碼 | |
$str = 'ht |
第一頁(yè)??& nbsp;?上一頁(yè)?& nbsp;??下一頁(yè) '; preg_match_all('/]*href=([^>]*)>下一頁(yè)/is', $str, $matches); print_r($matches[1]); |
//方法二
?代碼如下 | 復(fù)制代碼 |
preg_match('/下一頁(yè)/u', $s, $arr); |
/*
正則表達(dá)式到底是什么東西?
在編寫(xiě)處理字符串的程序或網(wǎng)頁(yè)時(shí),經(jīng)常會(huì)有查找符合某些復(fù)雜規(guī)則的字符串的需要。正則表達(dá)式就是用于描述這些規(guī)則的工具。換句話說(shuō),正則表達(dá)式就是記錄文本規(guī)則的代碼。
很可能你使用過(guò)windows/dos下用于文件查找的通配符(wildcard),也就是*和?。如果你想查找某個(gè)目錄下的所有的word文檔的話,你會(huì)搜索*.doc。在這里,*會(huì)被解釋成任意的字符串。和通配符類(lèi)似,正則表達(dá)式也是用來(lái)進(jìn)行文本匹配的工具,只不過(guò)比起通配符,它能更精確地描述你的需求——當(dāng)然,代價(jià)就是更復(fù)雜——比如你可以編寫(xiě)一個(gè)正則表達(dá)式,用來(lái)查找所有以0開(kāi)頭,后面跟著2-3個(gè)數(shù)字,然后是一個(gè)連字號(hào)"-",最后是7或8位數(shù)字的字符串(像010-12345678或0376-7654321)。

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