50 lines
3.0 KiB
Plaintext
50 lines
3.0 KiB
Plaintext
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From hjiwa@gruc19.nor.chevron.com (Jeff Wang)
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Subject: Re: nth occurance of a string
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Date: 9 Jun 93 17:27:41 GMT
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gaspar@angelo.amd.com (Harand Gaspar) writes:
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|> How does one find the nth occurance of a string or regualr expression
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|> in a file using vi?
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Try this keymap :-)
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"? v - Find the nth occurrence of the pattern on the current line.
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"? Enter pattern to search (can use regular expressions) on a new
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"? line, then enter number (>1 but no more than 60 occurrences)
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"? followed by \f in command mode to look for the pattern's nth
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"? occurrence. nowrapscan must be set. If a mistake was made in
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"? the pattern that was requested, u undo to bring back pattern.
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map v I@x^[a^M^M/^[:mo---^M"xddf@imz`add`z^["yddma@yk
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where ^[ are quoted <Escape> keys and ^M are quoted <Return> keys.
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Pressing the mapped key <v> (or whatever you map it to) will find the nth
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occurrence of the pattern on the current line. For example, if you want to go
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the 30 occurrence of the pattern "Due Date", enter "Due Date" on a new line.
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Then, press <3> <0> <v> without pausing. The pattern will be deleted and you
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will be brought down to the 30th occurrence of "Due Date", if it exists. If you
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press <u> to undo at this point, you will be returned back up to the pattern,
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where you may make changes if desired. Note that the counting of the number of
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occurrences begins at the point after the pattern is typed, not from the first
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line in the file. To find nth occurrence from the start of the file, enter the
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pattern on line 1. The keymap has a limit of finding up to the 60th occurrence
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of a pattern on the version of vi I am using before it chokes with the error
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message "Register too long to fit in memory". Your vi might allow more; if your
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vi also has this limit and you need to count more finds (say...the 200th
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occurrence), you could first find the 60th and then open up a new line, type the
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pattern again on the new line, and execute the keymap again to bring you down to
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the 120th occurrence, etc, etc. You must also "set nowrapscan" or else the
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keymap will wrap around the end of file and keep counting. If you enter a
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number that is greater than the actual number of occurrences, the keymap will
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bring you down to the last pattern that it found, but you will see the usual
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"Address search hit BOTTOM without matching pattern".
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Regular expressions can also be used. If you type "[Th]he /" on a new
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line, it will find and count all occurrences of "The" or "the" only if the
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word is followed by 3 spaces. If you type \<[Dd]ate\> on the line and then
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enter <4><5><v>, it will find the 45th occurrence of "Date" or "date" (only if
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it is an entire word), and skip past "dated", "Dates", etc. Basically, any
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valid vi search string can be used; the keymap just slaps a "/" in front of it
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and executes the find command "n" number of times.
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#====}==) #===(==} #====}==) #===(==} {==)===# (=={====# {==)===# (=={====#
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>> Jeff Wang Net : hjiwa@gruc19.
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