使用perl时,我在一个包含以下文本的大文件中“窃取”,并尝试为给定的正则表达式捕获文件中的所有正则表达式$1匹配项。我的正则表达式是
=~ /((GET|PUT|POST|CONNECT).*?(Content-Type: (image\/jpeg)))/sgm 当前以粗体显示的文本正在被捕获,但是,最后一次捕获正在处理行
"GET /~sgtatham/putty/latest/x86/pscp.exe HTTP/1.1" to "Content-Type: text/html; charset=iso-8859-1" 作为最后捕获的一部分,它不应该是b/c“文本/html”不等于我的正则表达式捕获的(image\/jpeg)。我希望能够捕获最后一个捕获,而不需要
"GET /~sgtatham/putty/latest/x86/pscp.exe HTTP/1.1" to "Content-Type: text/html; charset=iso-8859-1" being included.感谢您的帮助,谢谢。
**GET /~sgtatham/putty/latest/x86/pscp.exe HTTP/1.1
Host: the.earth.li
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:13.0) Gecko/20100101 Firefox/13.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: Keep-Alive
Content-Type: text/html; charset=iso-8859-1
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
\.+"
GET /~sgtatham/putty/0.62/x86/pscp.exe HTTP/1.1
Host: the.earth.li
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:13.0) Gecko/20100101 Firefox/13.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Content-Length: 315392
Keep-Alive: timeout=15, max=99
Connection: Keep-Alive
Content-Type: image/jpeg**
Platform: Digital Engagement Platform; Version: 1.1.0.0 发布于 2012-07-07 14:29:21
你可以用(?!pattern)很容易做到这一点,这是一个消极的前瞻性断言。有关概述,请阅读本文Positive examples of positive and negative lookahead (ourcraft.wordpress.com)
正则表达式
$text =~ /
( # start capture
(?:GET|PUT|POST|CONNECT) # start phrase
(?:
(?!GET|PUT|POST|CONNECT) # make sure we'havent any these phrase
. # accept any character
)*? # any number of times (not greedy)
Content-Type:\simage\/jpeg # end phrase
) # end capture
/msx;
print $1;所有实例
while($text =~ m/REGEXP/msxg) {
print $1;
}输出
GET /~sgtatham/putty/0.62/x86/pscp.exe HTTP/1.1
Host: the.earth.li
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:13.0) Gecko/20100101 Firefox/13.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Content-Length: 315392
Keep-Alive: timeout=15, max=99
Connection: Keep-Alive
Content-Type: image/jpeghttps://stackoverflow.com/questions/11372265
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