Regular Expression to search a Specific Value from the String

Question

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Hi,
I want a regex that i want to get the src value from the image tag

for example

<img title="abc" src="folder/MyImage.jpeg" alt="">

i want "folder/MyImage.jpeg"

How can i achieve using regex ???

Posted 4-Apr-13 6:41am

Arslan Elahi

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3 solutions

Solution 2

Well, it depends what you want to do, but I would use Balanced grouping with the start condition "<img" and the end condition ">"

For details on how to set it up:
In Depth with .NET RegEx Balanced Grouping[^]

And then there is just the matter of going though all the hits to find the src bit.

Or you can use this tool and generate the expression yourself
Expresso - A Tool for Building and Testing Regular Expressions[^]

Posted 4-Apr-13 7:26am

Kenneth Haugland

Updated 4-Apr-13 7:53am

v3

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**Zoltán Zörgő** · Accepted Answer · 2013-04-04T07:41:00

This is the expression you need: <img[^>]*?src=(['"])(.*?)\1.*?>. See linqpad sample:

C#

string pattern = @"<img[^>]*?src=(['""])(.*?)\1.*?>";
RegexOptions options = RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.Singleline;
string text = @"<a href=""/hireso/567-lexikon-aprilisi-nepi-joslatok"" class=""thumbnail"">
        <img src='http://koponyeg.hu/img/hirek/2013/04/small_130403lexikon_aprilisi_nepi_joslatok.jpg' />
</a>
<p>Újra eltelt a egy hónap, és az időjárással kapcsolatos népi megfigyelések áprilisi állomásához érkeztünk.</p>
<h4><a href='/hireso/536-lexikon-idojarasi-rekordok-a-vilagban'>Lexikon: időjárási rekordok a világban</a></h4>
<a href=""/hireso/536-lexikon-idojarasi-rekordok-a-vilagban"" class=""thumbnail"">
        <img src=""http://koponyeg.hu/img/hirek/2013/03/small_130312lexikon_idojarasi_rekordok_a_vilagban.jpg"" />
</a>
<p>Meteorológiai szélsőségekről szóló cikksorozatunk utolsó részéhez érkeztünk, amiben a világ rekordokról olvashatsz. Az előző cikkekben (1, 2) is voltak jócskán meglepő adatok, hát még a most következőben!</p>";

Regex re = new Regex(pattern, options);
var srcs = re.Matches(text).Cast<Match>().Select(x => x.Groups[2].Value);
srcs.Dump();

This last Dump() is a LinqPad thing, but the srcs varaible will hold a list of string with the src values from the img tags.

Thomas Daniels · Accepted Answer · 2013-04-04T06:48:00

Solution 1

Hi,

Have a look here:
http://stackoverflow.com/questions/5526094/regex-to-extract-attribute-value[^]

[EDIT]

But now I found that you can't parse HTML using a regular expression:
http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/[^]

To parse HTML, have a look at this article:
Parsing HTML Tags in C#[^]

You can also use the HtmlAgilityPack:
http://htmlagilitypack.codeplex.com/[^]

Posted 4-Apr-13 6:48am

Thomas Daniels

Updated 4-Apr-13 7:19am

v3

Comments

[no name] 4-Apr-13 13:05pm

(?<=\bsrc=")[^"]*
This expression help me if i've one image tag... if more than one tag then it is not working it just find the first src....
what i need to do can you help me????

Thomas Daniels 4-Apr-13 13:19pm

I updated my answer.