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Annotation of 43BSDTahoe/usr.lib/learn/editor/L33.2b, revision 1.1.1.1

1.1       root        1: #print
                      2: You can of course use the [] operators anywhere in
                      3: a pattern.  Editor patterns, by the way, are called
                      4: "regular expressions".  For example, suppose you wanted
                      5: to change either the word "trick" or the word "track"
                      6: to "stop".  What command would you need?
                      7: Do you see that
                      8: 
                      9:   s/tr[ia]ck/stop/p
                     10: 
                     11: will do that?  Now figure out what command you would
                     12: need to change either "bear" or "beat" into "best"
                     13: and print the line after the change.
                     14: Type "answer COMMAND" where COMMAND is that line.
                     15: #copyin
                     16: #user
                     17: #uncopyin
                     18: #match s/bea[rt]/best/p
                     19: #match s/bea[tr]/best/p
                     20: #match s/bea[rt]/best/
                     21: You forgot the "p" part.
                     22: #match s/bea[tr]/best/
                     23: You forgot the "p" part.
                     24: #log
                     25: #next
                     26: 33.2c 5

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