complex regular expression task
What regular expressions do I need to extract section title(s) in a text file?  So, in the following sample text, I'd like to extract
"Communication and Leadership", "1.Self-Knowledge", "2. Humility" and "(3) Clear Thinking".  Many thanks.

   Communication and Leadership
   True leaders understand that, rather than forcing their followers into a preconceived mold, their job is to motivate and organize 

followers to collectively accomplish goals that are in everyone's interests. The ability to communicate this to co-workers and followers is 

critical to the effectiveness of leadership. 

      1.Self-Knowledge
Superior leaders are able to devote their skills and energies to leadership of a group because they have worked through personal issues to 

the point where they know themselves thoroughly. A high level of self-knowledge is a prerequisite to effective communication skills, because 

the things that you communicate as a leader are coming from within.

      2. Humility
   This subversion of personal preference requires a certain level of humility. Although popular definitions of leaders do not always see 

them as humble, the most effective leaders actually are. This humility may not be expressed in self-effacement, but in a total commitment to 

the goals of the organization. Humility requires an understanding of one's own relative unimportance in comparison to larger systems. 

    (3) Clear Thinking
   Clarity of thinking translates into clarity of communication. A leader whose goals or personal analysis is muddled will tend to deliver 

unclear or ambiguous directions to followers, leading to confusion and dissatisfaction. A leader with a clear mind who is not ambivalent 

about her purposes will communicate what needs to be done in a straightforward and unmistakable manner.
complex regular expression task
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What regular expressions do I need to extract section title(s) in a text file?  So, in the following sample text, I'd like to extract
"Communication and Leadership", "1.Self-Knowledge", "2. Humility" and "(3) Clear Thinking".  Many thanks.

   Communication and Leadership
   True leaders understand that, rather than forcing their followers into a preconceived mold, their job is to motivate and organize 

followers to collectively accomplish goals that are in everyone's interests. The ability to communicate this to co-workers and followers is 

critical to the effectiveness of leadership. 

      1.Self-Knowledge
Superior leaders are able to devote their skills and energies to leadership of a group because they have worked through personal issues to 

the point where they know themselves thoroughly. A high level of self-knowledge is a prerequisite to effective communication skills, because 

the things that you communicate as a leader are coming from within.

      2. Humility
   This subversion of personal preference requires a certain level of humility. Although popular definitions of leaders do not always see 

them as humble, the most effective leaders actually are. This humility may not be expressed in self-effacement, but in a total commitment to 

the goals of the organization. Humility requires an understanding of one's own relative unimportance in comparison to larger systems. 

    (3) Clear Thinking
   Clarity of thinking translates into clarity of communication. A leader whose goals or personal analysis is muddled will tend to deliver 

unclear or ambiguous directions to followers, leading to confusion and dissatisfaction. A leader with a clear mind who is not ambivalent 

about her purposes will communicate what needs to be done in a straightforward and unmistakable manner.