Regular expression

A

Arun Kumar

Hi,
I know that what i'm going to ask is for the solution for a simple
problem. But as I'm new to Ruby I have not learnt a lot about regular
expressions in Ruby.

Can anybody tell me how to extract all the contents which are included
inside the '<html>' and '</html>' tag and also to extract the text given
in between the '<a>' and '</a>' tag using regular expression. I know it
can be extracted using the 'scan' method but I dont know what should be
the matching patterns or expressions. Can anybody pls help me

Regards
Arun
 
R

Ryan Davis

Hi,
I know that what i'm going to ask is for the solution for a simple
problem. But as I'm new to Ruby I have not learnt a lot about regular
expressions in Ruby.

Can anybody tell me how to extract all the contents which are included
inside the '<html>' and '</html>' tag and also to extract the text
given
in between the '<a>' and '</a>' tag using regular expression. I know
it
can be extracted using the 'scan' method but I dont know what should
be
the matching patterns or expressions. Can anybody pls help me
Click to expand...

regexps are about the worst thing to use in this case. Look at this
instead:

http://mechanize.rubyforge.org/files/GUIDE_txt.html
 
7

7stud --

Arun said:
Hi,
I know that what i'm going to ask is for the solution for a simple
problem. But as I'm new to Ruby I have not learnt a lot about regular
expressions in Ruby.

Can anybody tell me how to extract all the contents which are included
inside the '<html>' and '</html>' tag and also to extract the text given
in between the '<a>' and '</a>' tag using regular expression. I know it
can be extracted using the 'scan' method but I dont know what should be
the matching patterns or expressions. Can anybody pls help me

Regards
Arun
Click to expand...

s = "<a>hello world</a>"
new_s = s.gsub(/<.*?>/, "")
puts new_s

--output:--
hello world




html = DATA.read()
regex = Regexp.new("<html>(.*)</html>", Regexp::MULTILINE)
puts html[regex, 1]

__END__
<html>
<head>
<title>html page</title>
</head>
<body>
<div>hello</div>
<div>world</div>
<div>goodbye</div>
</body>
</html>


--output:--
<head>
<title>html page</title>
</head>
<body>
<div>hello</div>
<div>world</div>
<div>goodbye</div>
</body>


In the expression:

html[regex, 1]

The 1 says to return the first parenthesized group in the regex.
 
7

7stud --

7stud said:
regex = Regexp.new("<html>(.*)</html>", Regexp::MULTILINE)
Click to expand...

...oh, yeah. Normally, a . matches any character except a newline. The
regex .* matches any character 0 or more times--but to get it to match
newlines as well, you have to specify Regxp::MULTILINE.
 
7

7stud --

7stud said:
In the expression:

html[regex, 1]

The 1 says to return the first parenthesized group in the regex.
Click to expand...

To be a little clearer, the 1 says to return whatever matched the first
parenthesized group in the regex.
 
Y

Yaser Sulaiman

[Note: parts of this message were removed to make it a legal post.]

Can anybody tell me how to extract all the contents which are included
inside the '<html>' and '</html>' tag and also to extract the text given
in between the '<a>' and '</a>' tag using regular expression. I know it
can be extracted using the 'scan' method but I dont know what should be
the matching patterns or expressions. Can anybody pls help me
Click to expand...


Let's assume we have the following content:

<html>
<body>
<p>
Want a Ruby regular expression editor? Check out <a href="
http://www.rubular.com/">Rubular</a>.
</p>
</body>
</html>

Here are two quick and dirty regexps:

/<html>(.*)<\/html>/m
This regexp will capture anything between an opening html tag and a closing
one. the /m option specifies "Multiline Mode: "." will match any character
including a newline.
For our content, it will capture:
<body>
<p>
Want a Ruby regular expression editor? Check out <a href="
http://www.rubular.com/">Rubular</a>.
</p>
</body>

/<a.*>(.*)<\/a>/
This regexp will capture the text between an opening anchor element and a
closing one. The first ".*" is there to deal with href and any other
attribute. You might wanna throw the /m option in there too.
For our content, it will capture:
Rubular

I know that using mechanize or hpricot is a far better option in this
case. But i'm just asking as a matter of curiosity to know about regexps
Click to expand...


Dare I say, a man should use regexps if only to satisfy his curiosity. ;-)

Regards,
Yaser
 

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