regularexpression-reverse-pattern-search

A RegExp reverse pattern search in Javascript:

My colleague asked me for a solution on manipulating String, simply replacing all backslash with empty string, but only match backslash followed by anything but a backslash ‘\’. This is definitely a reverse pattern search case.

Solution

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function removeStandaloneBackslash (str){
    var reg = /\\(?=[^\\])/g;
    return str.replace(reg, '');
}

removeStandaloneBackslash("\\test\\\\abcdefg\\!@#$%^&*()");