Delphi DLL Requires Chilkat v11.1.0+

Regular Expression Replace Full Matches

See more Regular Expressions Examples

Demonstrates replacing the full matches of a regular expression.

Note: Chilkat uses PCRE2. See PCRE2 Regular Expressions
Also see: PCRE2 Performance

Delphi DLL

var
success: Boolean;
subject: PWideChar;
pattern: PWideChar;
sb: HCkStringBuilder;
json: HCkJsonObject;
timeoutMs: Integer;
numMatches: Integer;
sbTemp: HCkStringBuilder;
i: Integer;

begin
success := False;

subject := 'John Anders, +_+_+ Mary Robins $$$$';
pattern := '\\w+\\s+\\w+';

sb := CkStringBuilder_Create();
CkStringBuilder_Append(sb,subject);

json := CkJsonObject_Create();
CkJsonObject_putEmitCompact(json,False);

timeoutMs := 2000;
numMatches := CkStringBuilder_RegexMatch(sb,pattern,json,timeoutMs);
if (numMatches < 0) then
  begin
    //  Probably an error in the regular expression.
    //  Suggestion: Use AI to help create and/or diagnose regular expressions.
    Memo1.Lines.Add(CkStringBuilder__lastErrorText(sb));
    Exit;
  end;

//  Examine the matches:
Memo1.Lines.Add(CkJsonObject__emit(json));

//  {
//    "match": [
//      {
//        "group": [
//          {
//            "cap": "John Anders",
//            "idx": 0,
//            "len": 11
//          }
//        ]
//      },
//      {
//        "group": [
//          {
//            "cap": "Mary Robins",
//            "idx": 19,
//            "len": 11
//          }
//        ]
//      }
//    ]
//  }

sbTemp := CkStringBuilder_Create();

i := 0;
numMatches := CkJsonObject_SizeOfArray(json,'match');
while i < numMatches do
  begin

    CkJsonObject_putI(json,i);

    //  The full match is always in group 0.
    CkStringBuilder_Clear(sbTemp);
    CkJsonObject_StringOfSb(json,'match[i].group[0].cap',sbTemp);

    //  Indicate that we wish to replace the full match with it's value converted to uppercase.
    CkStringBuilder_ToUppercase(sbTemp);
    CkJsonObject_UpdateSb(json,'match[i].group[0].rep',sbTemp);

    i := i + 1;
  end;

//  The JSON now has replacement strings:
Memo1.Lines.Add(CkJsonObject__emit(json));

//  {
//    "match": [
//      {
//        "group": [
//          {
//            "cap": "John Anders",
//            "idx": 0,
//            "len": 11,
//            "rep": "JOHN ANDERS"
//          }
//        ]
//      },
//      {
//        "group": [
//          {
//            "cap": "Mary Robins",
//            "idx": 19,
//            "len": 11,
//            "rep": "MARY ROBINS"
//          }
//        ]
//      }
//    ]
//  }

//  Call RegexReplace to update the StringBuilder with the replacements.
success := CkStringBuilder_RegexReplace(sb,json);
if (success = False) then
  begin
    Memo1.Lines.Add(CkStringBuilder__lastErrorText(sb));
    Exit;
  end;

Memo1.Lines.Add('Result after doing replacements:');
Memo1.Lines.Add(CkStringBuilder__getAsString(sb));

//  Result after doing replacements:
//  JOHN ANDERS, +_+_+ MARY ROBINS $$$$

CkStringBuilder_Dispose(sb);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbTemp);