How to use regular expressions

[Code monkey]

Hello all,

thanks for helping me out last time. this time i had some trouble finding how to use regex. I am new to regex. This is what i want to do:

    if (oSession.HostnameIs(HOSTSITE) && oSession.uriContains(REGULAREXPRESSION)) {
                oSession["ui-color"] = "red";
                oSession["ui-backcolor"] = "yellow";
                count++;
                URLlog(oSession);

and i believe the regular expression for this site is http://(?:www\.)?HOSTSITE\.com/(?:embed-)?([\w]{12})+

is this possible? also how would i use REGEX in fiddler. i tried a the example from the website listed:

.*\.txt$

and it told me compile error.

any suggestions?

[EricLaw]

I'm not sure what example you are talking about. Your first problem is that uriContains takes a plaintext string, not a regular expression.

 

If you want to use a RegEx, grab the oSession.fullUrl property, then run your RegEx against that. See http://books.google.com/books?id=_ybRMWJufiEC&lpg=PA271&ots=UF0c41uVje&dq=justin%20rogers%20jscript.net%20regular%20expression&pg=PA270#v=onepage&q=justin%20rogers%20jscript.net%20regular%20expression&f=false and http://msdn.microsoft.com/en-us/library/28hw3sce(v=vs.71).aspx for details.

[survivor]

How do you specify options to a regular expression that is specified via a string? Specifically how do you turn on multiline in a utilReplaceRegexInResponse call?

 

Rosendo

[EricLaw]

In .NET, you can express regex flags inline before the expression.

 

See the Inline Character option here: http://msdn.microsoft.com/en-us/library/yd1hzczs.aspx

 

So, you can use, e.g. (?im)text$ to search for lines that end with "text" (case insensitively).

 

-Eric

[survivor]

Hi Eric,

 

It seems that the single line mode (s) regular expression option is on by default and the multiline mode (m) option does not work. For example in this piece of body content:

 

...

var _gaq = _gaq || [];
...

})();

...

 

I would like to replace everything from var to (); with my own content. And it works with this:

 

oSession.utilReplaceRegexInResponse('var _gaq = .*?}\\)\\(\\);', '(new-content)');

 

However in some cases the ending pattern could appear twice so I would like to help it match by indicating that it occurs at the start of a line:

 

oSession.utilReplaceRegexInResponse('(?m)var _gaq = .*?^}\\)\\(\\);', '(new-content)');

 

but it doesn't work (nothing is replaced).

 

 

[EricLaw]

Yes, the Single-Line option is on-by-default. It's interesting, but not altogether surprising to learn that the "m" option doesn't override the "s" option.

 

Having said that, this should be simple enough to workaround, given the definition of Single-Line mode:

 

Specifies single-line mode. Changes the meaning of the dot (.) so it matches every character (instead of every character except \n). You should be able to use [\r?\n] to match an end-of-line sequence.