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Annotation of 42BSD/usr.lib/learn/editor/L38.2a, revision 1.1.1.1

1.1       root        1: #print
                      2: Sometimes you want to recognize a string of characters
                      3: only if they appear at the beginning of the line.
                      4: The character '^' is used for this purpose.  The
                      5: command
                      6:   s/^ab/xy/
                      7: will change "ab" to "xy" only if "ab" begins the line.
                      8: Try the following and watch what it does.
                      9: 
                     10: ex file
                     11: 1,2p
                     12: 1,2s/^ab/xy/
                     13: wq
                     14: ready
                     15: #create Ref
                     16: xycd
                     17:   abcd
                     18: #create file
                     19: abcd
                     20:   abcd
                     21: #user
                     22: #cmp file Ref
                     23: #log
                     24: #next
                     25: 38.2b  5

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