PureBasic 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

PureBasic

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkJsonObject.pb"

Procedure ChilkatExample()

    success.i = 0

    subject.s = "John Anders, +_+_+ Mary Robins $$$$"
    pattern.s = "\w+\s+\w+"

    sb.i = CkStringBuilder::ckCreate()
    If sb.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkStringBuilder::ckAppend(sb,subject)

    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::setCkEmitCompact(json, 0)

    timeoutMs.i = 2000
    numMatches.i = CkStringBuilder::ckRegexMatch(sb,pattern,json,timeoutMs)
    If numMatches < 0
        ;  Probably an error in the regular expression.
        ;  Suggestion: Use AI to help create and/or diagnose regular expressions.
        Debug CkStringBuilder::ckLastErrorText(sb)
        CkStringBuilder::ckDispose(sb)
        CkJsonObject::ckDispose(json)
        ProcedureReturn
    EndIf

    ;  Examine the matches:
    Debug CkJsonObject::ckEmit(json)

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

    sbTemp.i = CkStringBuilder::ckCreate()
    If sbTemp.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    i.i = 0
    numMatches = CkJsonObject::ckSizeOfArray(json,"match")
    While i < numMatches

        CkJsonObject::setCkI(json, i)

        ;  The full match is always in group 0.
        CkStringBuilder::ckClear(sbTemp)
        CkJsonObject::ckStringOfSb(json,"match[i].group[0].cap",sbTemp)

        ;  Indicate that we wish to replace the full match with it's value converted to uppercase.
        CkStringBuilder::ckToUppercase(sbTemp)
        CkJsonObject::ckUpdateSb(json,"match[i].group[0].rep",sbTemp)

        i = i + 1
    Wend

    ;  The JSON now has replacement strings:
    Debug CkJsonObject::ckEmit(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::ckRegexReplace(sb,json)
    If success = 0
        Debug CkStringBuilder::ckLastErrorText(sb)
        CkStringBuilder::ckDispose(sb)
        CkJsonObject::ckDispose(json)
        CkStringBuilder::ckDispose(sbTemp)
        ProcedureReturn
    EndIf

    Debug "Result after doing replacements:"
    Debug CkStringBuilder::ckGetAsString(sb)

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


    CkStringBuilder::ckDispose(sb)
    CkJsonObject::ckDispose(json)
    CkStringBuilder::ckDispose(sbTemp)


    ProcedureReturn
EndProcedure