I only want space, not tabs or new lines

Then yes, substitute "\s" with "" or "\040". Keep in mind that HTML doesn't know the difference between spaces, tabs and newlines.

Is there a difference between inkgmi's and GrandFather's entry?

I think mine is a teeny bit faster. (One less character to add to $1, one less operation in building the replacement string, one less character to replace.)

I thought executed regexs are experimental

Just
(?{ code }),
(??{ code }),
(?>pattern) and
(?(condition)yes-pattern|no-pattern),
none of which were used here. /e has been around for quite some time and is reliable.

In reply to Re^3: Converting multiple spaces to nbsp by ikegami
in thread Converting multiple spaces to nbsp by eastcoastcoder

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