How to use regular expressions to return only a part of a file name?
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I am having trouble to create a regular expression that returns only a part of a string.

Passing the following strings:

    /path/of/the/file/1 - 2 - Lecture 1.2_ Max Bense (13_49).mp4
    /path/of/the/file/1 - 3 - Lecture 1.3_ Michael Friedman (12_15).mp4
    /path/of/the/file/2 - 1 - Lecture 2.1_ Paul Feyerabend (12_55).mp4
    /path/of/the/file/2 - 2 - Lecture 2.2_ Alhazen (11_37).mp4
    /path/of/the/file/3 - 2 - Lecture 3.2_ Study Case - Dominicus Gundissalinus (14_30).mp4 
    /path/of/the/file/3 - 3 - Lecture 3.3_ Study Case - Carl Friedrich von Weizsacker (11_48).mp4


It should return only the following parts respectively:

    Max Bense
    Michael Friedman
    Paul Feyerabend
    Alhazen
    Study Case - Dominicus Gundissalinus
    Study Case - Carl Friedrich von Weizsacker