Ruby on Rails string scan and regular expression

Question

I wanted to get image url "http://www.test.com/image.jpg" out from the string:

"&lt;img align=&quot;right&quot; alt=&quot;Title &quot; src=&quot;http://www.test.com/image.jpg&quot; width=&quot;120&quot; /&gt;&lt;"

Here is the code that I have:

module MyHelper

    def getMymage(allDesc)
        allDesc = "&lt;img align=&quot;right&quot; alt=&quot;Title &quot; src=&quot;http://www.test.com/image.jpg&quot; width=&quot;120&quot; /&gt;&lt;"
        allDesc = allDesc.scan(src=&quot;(\S+)&quot;)
    end
end

I got the following error:

syntax error, unexpected tAMPER
        allDesc = allDesc.scan(src=&quot;(\S+)&quot;)
                                    
syntax error, unexpected $undefined
        allDesc = allDesc.scan(src=&quot;(\S+)&quot;)

How to fix it?

Please correct the encoding of pasted text, it would be much easier to help you then! — fuzzyalej
– fuzzyalej, Commented Sep 4, 2011 at 18:00

kunal · Accepted Answer · 2011-09-04 18:03:39Z

3

Can't comment on sunkencity's answer, but regex that solves the dash problem is:

/src=\&quot;([a-z0-9_.\-:\/]+)&quot;/i

answered Sep 4, 2011 at 18:03

kunal

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2 Comments

Shadow_boi Over a year ago

i tried allDesc =~ /src=\"([a-z0-9_.\-:\/]+)"/i but it doesn't return anything?

Shadow_boi Over a year ago

even with this: allDesc =~ /src=\"([a-z0-9_.\-:\/]+)"/i && $1

sunkencity · Accepted Answer · 2011-12-11 09:10:21Z

2

The regexp is missing a start "/" and some extra stuff

allDesc.scan(/src=\&quot;([a-z0-9_.\-:\/]+)&quot;/i)

but you get an array as a response:

=> [["http://www.test.com/image.jpg"]]

I'd suggest using the matching operator and then use the first match variable:

allDesc =~ /(http:\/\/[a-z0-9_.-i\/]+)/ && $1

edited Dec 11, 2011 at 9:10

answered Sep 4, 2011 at 17:49

sunkencity

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7 Comments

Shadow_boi Over a year ago

Thanks. almost there. Just a little bug. for image url like: test.com/images/1-2-3.jpg, it returns the url: test.com/images/1

Shadow_boi Over a year ago

I modified it a bit: allDesc =~ /(http:\/\/\S+)/ && $1 , but there is quotation at the end.

sunkencity Over a year ago

Just put a & outside your matching group like this allDesc =~ /(http:\/\/\S+)&/ && $1 => "test.com/image.jpg"

Shadow_boi Over a year ago

allDesc =~ /(http:\/\/\S+)&/ && $1 doesn't return anything tho

sunkencity Over a year ago

does allDesc still contain the string? works for me: ree-1.8.7-2010.02 :043 > allDesc => "<img align="right" alt="Title " src="test.com/image.jpg" width="120" /><" ree-1.8.7-2010.02 :044 > allDesc =~ /src=\"([a-z0-9_.\-:\/]+)"/i && $1 => "test.com/image.jpg"

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