From: yermej <yermej@...>
Date: 2007-11-27T07:55:00+09:00
Subject: Re: About a regular expression

On Nov 26, 4:02 pm, T5in9tao Tsingtao <t5in9...@gmail.com> wrote:
> Hi,
>
> I really don't unserstand why my regular expression don't scan a string.
> My goal is to match in a string a domain name. I copy/past my code here:
>
> --------------------------------
>
> #! /usr/bin/env ruby
>
> domain_name =
> "[a-zA-Z0-9-]{1,63}\.(aero|biz|cat|com|coop|edu|gov|info|int|jobs|mil|mobi|museum|name|net|org|travel|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zr|zw)"
>
> string = "<p><strong><a
> href=\"http://haiku-os.org\">Haïku</a></strong></p>"
> result = string.scan(/#{domain_name}/)
> result.each { |x| puts x }
>
> --------------------------------
>
> About me, there is a trouble near the dot. But normaly it's okay thanks
> to ".\" ...
>
> Thank you for help.
> --
> Posted viahttp://www.ruby-forum.com/.

Since your first "\." is inside a double-quoted string, it being put
in the regex as just ".". Either define domain_name with "\\." in
place of "\." or use single quotes instead of double.

Or you could define domain_name to be the regex:

domain_name = /[a-zA-Z0-9-]{1,63}\.(aero|biz|cat|[long regex cut]/
...
result = string.scan(domain_name)