Re: Can't figure out how to invert this regex

If I recall, an entity can be only alphanums, so this should do it:

s/&(?![A-Za-z0-9]+;)/REPLACED/g;
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Literally: an ampersand not followed by (1 or more alphanums followed by a semicolon).

If that's not the correct definition of an entity, season to taste.

Not sure why you were looking to the left to determine ampersandy-ness. The interesting part is to the right.

update: Ahh yes, the pound form. And the #x form. OK, try this:

s/&(?!(?:[A-Za-z0-9]+|#\d+|#x[0-9A-Fa-f]+);)/REPLACED/g;
[download]

Comment on Re: Can't figure out how to invert this regex Select or Download Code

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Re^2: Can't figure out how to invert this regex by Anonymous Monk on Nov 25, 2005 at 15:05 UTC
actually, an entity can also have the form { so there would be a need to check for a pound as well as alpha-num.	[reply]
Re^2: Can't figure out how to invert this regex by Anonymous Monk on Nov 25, 2005 at 15:03 UTC
"Not sure why you were looking to the left to determine ampersandy-ness." Just a mistake out of my own inexperience with regex's. I didn't really understand where it was looking. Now I get it.	[reply]