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Matching using Regex inside a file

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# 1  
Old 11-17-2009
Matching using Regex inside a file
I need scan through some files, then open the file one by one and scan inside the file using perl to see if it contain a start tag and end tag which the end tag is the mirror image of the start tag, the start tag and end tag only have 5 char. And inside the file there is "http://". It is just a if-else statement. Eg. If the file match this example, i want to print the file name out. Below is the example:

<start>jdahsjdaskjdsahttp://sanhdjashd<trats>

Anyone can help??
Last edited by blueblur; 11-17-2009 at 11:32 PM..
# 2  
Old 11-17-2009
Quote:
Originally Posted by blueblur
... open a file and scan inside ...
to see if it contain a start tag and end tag which the end tag is the mirror image of the start tag and inside the file there is "http://"
...
And do what having seen it ?

I assume you want to print that line.
Here's a way to do it with Perl:

Code:
$
$ cat -n f9
     1  <mytag>something here</mytag>
     2  <start>jdahsjdaskjdsahttp://sanhdjashd<trats>
     3  <show>Wicked</show>
     4  A line here
     5  <author>Gregory Maguire</author>
     6  <venue>Broadwayhttp://www.broadway.com/shows/wicked<eunev>
     7  and here...
     8  <theme>Reimagining of The Wizard of Oz<emeht>
     9  <verdict>amazinghttp://amazing<tcidrev>
$
$ perl -lne 'print if /^<(.*)>.*http:\/\/.*<(.*)>/ and $2 eq reverse $1' f9
<start>jdahsjdaskjdsahttp://sanhdjashd<trats>
<venue>Broadwayhttp://www.broadway.com/shows/wicked<eunev>
<verdict>amazinghttp://amazing<tcidrev>
$
$

tyler_durden
# 3  
Old 11-17-2009
I have just amended my question. sry for the trouble. 1st time ask question here.
# 4  
Old 11-25-2009
'print if /^<(.*)>.*http:\/\/.*<(.*)>/ and $2 eq reverse $1'

How about i want 186 char in "*http:\/\/" portion?
# 5  
Old 11-26-2009
Quote:
Originally Posted by blueblur
'print if /^<(.*)>.*http:\/\/.*<(.*)>/ and $2 eq reverse $1'

How about i want 186 char in "*http:\/\/" portion?
I don't think I understood your question. In the perl one-liner posted earlier:

Code:
.*http:\/\/.*

checks for the text between the tags. The regex matches the text if -

(1) there are 0 or more characters right after the ">" character of the opening tag
(2) followed by the characters "http://"
(3) followed by 0 or more characters till the "<" character of the closing tag.

How do 186 characters fit into this picture ?
- 186 characters before "http://" ? After "http://" ? Including "http://" ?
- Also, <= 186 characters ? Exactly 186 ? >= 186 ?

tyler_durden
# 6  
Old 11-26-2009
Quote:
Originally Posted by durden_tyler
How do 186 characters fit into this picture ?
- 186 characters before "http://" ? After "http://" ? Including "http://" ?
- Also, <= 186 characters ? Exactly 186 ? >= 186 ?
tyler_durden

-Exactly 186 char including "http://"
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