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8.4.3.7 search-spaces-regexp—a variable

Function: search-spaces-regexp ¶

If this variable is non-‘nil’, it should be a regular expression that says how to search for whitespace. In that case, any group of spaces in a regular expression being searched for stands for use of this regular expression.

Since this variable affects all regular expression search and match constructs, you should bind it temporarily for as small as possible a part of the code.