I am making a program in C# that reads an html file that another one of my programs has outputted.

Code:
<input type="hidden" name="value5" value="1247555244" />
what i need to find is what value equals, eg i need something to return "1247555244" and only that.

Please keep in mind that there is much other html than this in the file. i am new to regex and i need someone to show me how to make a regular expression for use in c# to find a value that contains all digits and return only those digits.

Thanks.