Delphi replace string with callback

Question

In JavaScript it is possible to replace string with callback that takes matches as arguments using regular expressions.

function replacer(match, p1, p2, p3, offset, string){
  // p1 is nondigits, p2 digits, and p3 non-alphanumerics
  return [p1, p2, p3].join(' - ');
};
newString = "abc12345#$*%".replace(/([^\d]*)(\d*)([^\w]*)/, replacer);

Is there a way to do something like this in Delphi? I tried to search but did not find anything useful.

AFAIK, there is not a similar function in Delphi, but you can build your own using anonymous methods and regular expressions. — RRUZ
– RRUZ, Commented Nov 28, 2013 at 20:47
Thanks for the links. I will read that and try to do something. I hoped that Delphi has some built-in functions for that. — kromol
– kromol, Commented Nov 28, 2013 at 21:06
A bit unrelated, but fyi, [^\d] is synonymous with \D, and [^\w] with \W. Good luck! — Firas Dib
– Firas Dib, Commented Nov 29, 2013 at 0:05

Jan Goyvaerts · Accepted Answer · 2013-12-16 13:46:56Z

2

Delphi's TPerlRegEx class has an OnReplace event handler that is called by the Replace and ReplaceAll methods for each replacement. You can use this event handler to achieve the same that you'd use a callback for in JavaScript.

In addition, the TRegEx.Replace method has overloads that take a TMatchEvaluator parameter. This type is a function reference which is used as a callback just like in JavaScript.

edited Dec 16, 2013 at 13:46

answered Dec 16, 2013 at 13:40

Jan Goyvaerts

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