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Quick tip to use vim to convert from HTML to XHTML

Since all tags in XHTML need to be lower-case, you can fix them like this:

:%s/<\([a-zA-Z]*\)\(\s\|>\)/<\L\1\E\2/g

To fix many of the tag-attributes, you could use:

:%s/\([a-zA-Z]*\)="/\L\1\E="/g

:%s/\([a-zA-Z]*\)='/\L\1\E='/g

That'll lower-case all the words ending with a =" or ='

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