(? < = / / |) (w) +.) + w +) (: (d +)) how to understand this rule
(? < = / / |) (w) +.) + w +) (: (d +)) how to understand this rule
this regular wants to match the URL, similar to this one (with domain name and port number) http://second.www.baidu.com:8080 and second.www.baidu.com:8080 , take the part after or after the beginning of / / . There is something wrong with the regular writing of
. The intention of / / should be changed to \ /\ / after adding escape characters, and the intention of (\ w) + should be written as \ w + .
rewrote (? < =\ /\ / | ^) ((\ w +\.) (\: (\ d +))
explain in segments:
(? < =\ /\ / ^) requires that the matching target must be preceded by / / or the matching target must be at the front. (\ w +\.) +\ w + match text. one or more + text, such as abcd.efgh abcd.efgh.izk abcd.efgh.izk.sfds can be matched, abcd cannot be matched alone \: (\ d+) match : multiple digits , that is, port number Previous: Visit the Qiniu download link to download apk and {"error": "download token auth failed"} appears.
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$res = preg_match_all( src="(.+ .(png|jpg))"+? , <img src=" Public attached image 20170227 20170227143202_25223.jpg" alt="" ><img src="Public attached image 20170227 20170227143202_25223.jpg" alt=&...
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:span : <span style="color:red">< span><span>good< span> :<span style="color:red">< span><span>good< span> ...
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<span style="text-align: justify; font-size: 114px;"><span> <span style="text-align: justify; font-size: 114px;"><span> as in the text above, I want to get all the values with px set. I originally wrote Patte...
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