[ale] regexp help

[ale at spinnerdog.com (David Hamm)]

Hi,

I need to move a number of .htm files to a Linux web server,  but the support 
image file names are all in random case and so are the src= tags.

Can anyone tell me how to convert the case of the file name referenced in the 
following line.

src="../images/XyZ.gif"  to src="../images/xyz.gif"

I'm working with s/src\=\".*\"/ but don't know how to specify changing the 
case to lower in the replacement side of the regular expression.

Thanks.