Lianja 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

Lianja

llSuccess = .F.

lcSubject = "John Anders, +_+_+ Mary Robins $$$$"
lcPattern = "\\w+\\s+\\w+"

loSb = createobject("CkStringBuilder")
loSb.Append(lcSubject)

loJson = createobject("CkJsonObject")
loJson.EmitCompact = .F.

lnTimeoutMs = 2000
lnNumMatches = loSb.RegexMatch(lcPattern,loJson,lnTimeoutMs)
if (lnNumMatches < 0) then
    //  Probably an error in the regular expression.
    //  Suggestion: Use AI to help create and/or diagnose regular expressions.
    ? loSb.LastErrorText
    release loSb
    release loJson
    return
endif

//  Examine the matches:
? loJson.Emit()

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

loSbTemp = createobject("CkStringBuilder")

i = 0
lnNumMatches = loJson.SizeOfArray("match")
do while i < lnNumMatches

    loJson.I = i

    //  The full match is always in group 0.
    loSbTemp.Clear()
    loJson.StringOfSb("match[i].group[0].cap",loSbTemp)

    //  Indicate that we wish to replace the full match with it's value converted to uppercase.
    loSbTemp.ToUppercase()
    loJson.UpdateSb("match[i].group[0].rep",loSbTemp)

    i = i + 1
enddo

//  The JSON now has replacement strings:
? loJson.Emit()

//  {
//    "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.
llSuccess = loSb.RegexReplace(loJson)
if (llSuccess = .F.) then
    ? loSb.LastErrorText
    release loSb
    release loJson
    release loSbTemp
    return
endif

? "Result after doing replacements:"
? loSb.GetAsString()

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


release loSb
release loJson
release loSbTemp