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Annotation of 42BSD/usr.lib/learn/editor/L35.1a, revision 1.1.1.1

1.1       root        1: #print
                      2: The "*" character is also used in substitute commands,
                      3: but it has a different meaning.  Here it means
                      4: "any number of repetitions of the previous character".
                      5: (including zero!).  Thus
                      6:   a*
                      7: is any number of 'a' characters, and
                      8:   [ab]*
                      9: is any number of either 'a' or 'b' characters.  So
                     10:   s/ab*/xy/
                     11: looks for an 'a' followed by any number of 'b'
                     12: letters, and will change
                     13:    abbb cde
                     14: into
                     15:    xy cde
                     16: You can use '*' after anything, including for example
                     17: blank.  Thus 
                     18:   s/a */a/
                     19: removes all the blanks after the letter 'a'.  In this
                     20: directory there is a file 'text'.  On the third line,
                     21: remove the blanks after the word 'the'.  Then rewrite the
                     22: file and type "ready".
                     23: #create Ref
                     24: This is the file
                     25: for experimentation
                     26: with the(substitute)
                     27: command.
                     28: #create text
                     29: This is the file
                     30: for experimentation
                     31: with the                  (substitute)
                     32: command.
                     33: #user
                     34: #cmp text Ref
                     35: #log
                     36: #next
                     37: 36.1a 10
                     38: 36.2a 5

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