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Annotation of 43BSD/usr.lib/learn/editor/L35.2a, revision 1.1.1.1

1.1       root        1: #print
                      2: The '*' character is also used in the editor patterns (the regular
                      3: expressions) but it has quite a different meaning from '*'
                      4: as used in filenames.  In the editor it means "any
                      5: number of repetitions of the previous character."  Thus
                      6:   a*
                      7: might match "a" or "aa" or "aaa" or "aaaa" and so on.
                      8: It might also match nothing, because "any number
                      9: of repetitions" includes "zero"!  Perhaps it
                     10: will be clearer after you do the following example.
                     11: Note what happens to the two lines.  Type
                     12: 
                     13: ex file
                     14: 1,2p
                     15: 1s/xa*/xy/
                     16: 2s/xa*/xy/
                     17: 1,2p
                     18: wq
                     19: ready
                     20: #create Ref
                     21: abxy
                     22: abxycd
                     23: #create file
                     24: abxaaa
                     25: abxcd
                     26: #user
                     27: #cmp file Ref
                     28: #log
                     29: #next
                     30: 35.2b 5

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