Home > Article > Backend Development > javascript - 正则贪婪模式,怎么搞清楚?总是一下子把后面的都给匹配上了
javascript - 正则贪婪模式,怎么搞清楚?总是一下子把后面的都给匹配上了
- WBOYOriginal
- 2016-06-06 20:15:121277browse
<code>t=edc9624908fac06b969fc8b3454d4d75; cna=rz39DUM8tSgCAXLjRlx1SJH8; l=Ah8fI61XmUXv5/-aXUJ9Fiy3732phHMm; lzstat_uv=7058553501377199257|1774292@1774054; cookie2=fa6653f49ed68b38b469988a4f1a2ac7; _tb_token_=obU42Ba54Lp; v=0; cookie32=d2874877ef98c1c142fc1ddff656fb50; cookie31=MTA5NzY3MjEsa2lzdGVhcixqc3djQDE2My5jb20sbnVsbA%3D%3D; alimamapwag=TW96aWxsYS80LjAgKGNvbXBhdGlibGU7IE1TSUUgNy4wOyBXaW5kb3dzIE5UIDYuMjsgV09XNjQ7IFRyaWRlbnQvNy4wOyAuTkVUNC4wQzsgLk5FVDQuMEU7IC5ORVQgQ0xSIDIuMC41MDcyNzsgLk5FVCBDTFIgMy4wLjMwNzI5OyAuTkVUIENMUiAzLjUuMzA3Mjkp; login=W5iHLLyFOGW7aA%3D%3D; alimamapw=DggWRANZRTAHBVcABwAEBQRbUFZcAgVeB1oEBwAHU1AEA1INVAUAUg%3D%3D </code>
上面这个COOKIES 用正则匹配_tb_token_=obU42Ba54Lp;这个值,
用这个表达式直接把后面一长串都给匹配上了,
然后变成这样了_tb_token_=obU42Ba54Lp; v=0; cookie32=d2874877ef98c1c142fc1ddff656fb50; cookie31=MTA5NzY3MjEsa2lzdGVhcixqc3djQDE2My5jb20sbnVsbA%3D%3D; alimamapwag=TW96aWxsYS80LjAgKGNvbXBhdGlibGU7IE1TSUUgNy4wOyBXaW5kb3dzIE5UIDYuMjsgV09XNjQ7IFRyaWRlbnQvNy4wOyAuTkVUNC4wQzsgLk5FVDQuMEU7IC5ORVQgQ0xSIDIuMC41MDcyNzsgLk5FVCBDTFIgMy4wLjMwNzI5OyAuTkVUIENMUiAzLjUuMzA3Mjkp; login=W5iHLLyFOGW7aA%3D%3D; alimamapw=DggWRANZRTAHBVcABwAEBQRbUFZcAgVeB1oEBwAHU1AEA1INVAUAUg%3D%3D
我知道用\W可以搞定,但是我非要用.*的话应该怎么弄?就匹配到第一个;?
回复内容：
<code>t=edc9624908fac06b969fc8b3454d4d75; cna=rz39DUM8tSgCAXLjRlx1SJH8; l=Ah8fI61XmUXv5/-aXUJ9Fiy3732phHMm; lzstat_uv=7058553501377199257|1774292@1774054; cookie2=fa6653f49ed68b38b469988a4f1a2ac7; _tb_token_=obU42Ba54Lp; v=0; cookie32=d2874877ef98c1c142fc1ddff656fb50; cookie31=MTA5NzY3MjEsa2lzdGVhcixqc3djQDE2My5jb20sbnVsbA%3D%3D; alimamapwag=TW96aWxsYS80LjAgKGNvbXBhdGlibGU7IE1TSUUgNy4wOyBXaW5kb3dzIE5UIDYuMjsgV09XNjQ7IFRyaWRlbnQvNy4wOyAuTkVUNC4wQzsgLk5FVDQuMEU7IC5ORVQgQ0xSIDIuMC41MDcyNzsgLk5FVCBDTFIgMy4wLjMwNzI5OyAuTkVUIENMUiAzLjUuMzA3Mjkp; login=W5iHLLyFOGW7aA%3D%3D; alimamapw=DggWRANZRTAHBVcABwAEBQRbUFZcAgVeB1oEBwAHU1AEA1INVAUAUg%3D%3D </code>
上面这个COOKIES 用正则匹配_tb_token_=obU42Ba54Lp;这个值,
用这个表达式直接把后面一长串都给匹配上了,
然后变成这样了_tb_token_=obU42Ba54Lp; v=0; cookie32=d2874877ef98c1c142fc1ddff656fb50; cookie31=MTA5NzY3MjEsa2lzdGVhcixqc3djQDE2My5jb20sbnVsbA%3D%3D; alimamapwag=TW96aWxsYS80LjAgKGNvbXBhdGlibGU7IE1TSUUgNy4wOyBXaW5kb3dzIE5UIDYuMjsgV09XNjQ7IFRyaWRlbnQvNy4wOyAuTkVUNC4wQzsgLk5FVDQuMEU7IC5ORVQgQ0xSIDIuMC41MDcyNzsgLk5FVCBDTFIgMy4wLjMwNzI5OyAuTkVUIENMUiAzLjUuMzA3Mjkp; login=W5iHLLyFOGW7aA%3D%3D; alimamapw=DggWRANZRTAHBVcABwAEBQRbUFZcAgVeB1oEBwAHU1AEA1INVAUAUg%3D%3D
我知道用\W可以搞定,但是我非要用.*的话应该怎么弄?就匹配到第一个;?
1.findall,search皆可，注意方法返回的值
2.pattern写法，注意贪婪和非贪婪匹配
3.HEREDOC是不错的选择，字符串长的时候
<code>import re
string = """
t=edc9624908fac06b969fc8b3454d4d75;
cna=rz39DUM8tSgCAXLjRlx1SJH8;
l=Ah8fI61XmUXv5/-aXUJ9Fiy3732phHMm;
lzstat_uv=7058553501377199257|1774292@1774054;
cookie2=fa6653f49ed68b38b469988a4f1a2ac7;
_tb_token_=obU42Ba5
4Lp;
v=0; cookie32=d2874877ef98c1c142fc1ddff656fb50;
cookie31=MTA5NzY3MjEsa2lzdGVhcixqc3djQDE2My5jb20sbnVsbA%3D%3D;
alimamapwag=TW96aWxsYS80LjAgKGNvbXBhdGlibGU7IE1TSUUgNy4wOyBXaW5kb3dzIE5UIDYuMjsgV09XNjQ7IFRyaWRlbnQvNy4wOyAuTkVUNC4wQzsgLk5FVDQuMEU7IC5ORVQgQ0xSIDIuMC41MDcyNzsgLk5FVCBDTFIgMy4wLjMwNzI5OyAuTkVUIENMUiAzLjUuMzA3Mjkp;
login=W5iHLLyFOGW7aA%3D%3D;
alimamapw=DggWRANZRTAHBVcABwAEBQRbUFZcAgVeB1oEBwAHU1AEA1INVAUAUg%3D%3D
""";
#注意匹配不到的情况,加个判断
list = re.findall("_tb_token_=(.*?);", string, re.S)
print(list[0])</code>
<code class="C">
out=re.search("_tb_token_=(.*?);",token).groups()[0]
print(out)</code>