PureBasic

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

    success = 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