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var str = 'The quick brown fox @ ';
var str = str.split(/\s/);
var str = str.join('_');
The result of this operation is “The_quick_brown_fox_@_”, How can I only split if the space is followed by a character and this character is not a “@”?
Use lookahead:
Yields
Joins into: “The_quick_brown_fox @ “