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