3

使用 perl，我在一个包含下面文本的大文件中“slurped”，我正在尝试$1为给定的正则表达式捕获文件中的所有正则表达式匹配项。我的正则表达式是

=~ /((GET|PUT|POST|CONNECT).*?(Content-Type: (image\/jpeg)))/sgm

目前正在捕获粗体文本，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"

作为最后一次捕获的一部分，它不应该 b/c "text/html" 不等于我的(image\/jpeg). 我希望能够在没有

"GET /~sgtatham/putty/latest/x86/pscp.exe HTTP/1.1" to "Content-Type: text/html; charset=iso-8859-1" being included.

感谢任何帮助，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
4

1 回答 1

3

你可以很容易地做到这一点(?!pattern)，这是一个消极的前瞻断言。回顾一下这篇文章正面和负面前瞻性的正面例子（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;

所有出现

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/jpeg
于 2012-07-07T06:29:20.693 回答