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Joined: Mar 2005
Posts: 20
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Erebus Offline OP
Ameglian cow
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Ameglian cow
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Joined: Mar 2005
Posts: 20
If I have a number of occurences of a substring in a string, is there any way I can replace a specific occurence, rather than all occurences.

I have tried everything, but as of yet I have not found a way to accomplish this.

For example, if I have the string 'testabtestabtestab' and want to replace the second occurence of 'ab' with 'ing' but none of the others, how could I do this? If possible, a general way that can be applied to different strings and substrings.

I would aprecaite any help,

Thanks a lot.

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Anonymous
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pass through the string searching for the n occurence. once you found it, remeber the index of the first letter of the pattern (in the string).

pass again through the string and replace the pattern with your text (begining with the caracter at the index position).

Joined: Mar 2005
Posts: 20
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Erebus Offline OP
Ameglian cow
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Thanks a lot for the reply,

How exactly should I go about doing this? I'm not certain I follow what you mean

Thanks.

Joined: Apr 2003
Posts: 701
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Hoopy frood
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Hoopy frood
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Posts: 701
Place this in your remotes tab (alt-r twice):
Code:
; $1 = text, $2 = substring, $3 = occurrence number, $4 = replacement
; example: $onesubst(ffabcabdabeabf,ab,3,__) returns ffabcabd__eabf
alias onesubst {
  var %3 = $3 - 1, %2 = $+(\Q,$replacecs($2,\E,\E\E\Q),\E)
  var %re = ^((?:.*? $+ %2 $+ ){ $+ %3 $+ }.*?) $+ %2
  var %res, %4 = $replace($4,\,\\), %u = $regsub($1,%re,\1 $+ $4, %res)
  echo -s 3: %3 ,2: %2 ,4: %4 ,re: %re ,u: %u
  return %res
}

//Echo -s $onesubst(testabtestabtestab,ab,2,ing)
testabtestingtestab


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