AutoIt Requires Chilkat v11.1.0+

Regular Expression Replace Capture Groups

See more Regular Expressions Examples

Demonstrates replacing capture groups for a regular expression.

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

AutoIt

Local $bSuccess = False

Local $subject = "John Anders, +_+_+ Mary Robins $$$$"
Local $sPattern = "(?<first>\w+)\s+(?<last>\w+)"

$oSb = ObjCreate("Chilkat.StringBuilder")
$oSb.Append($subject)

$oJson = ObjCreate("Chilkat.JsonObject")
$oJson.EmitCompact = False

Local $iTimeoutMs = 2000
Local $iNumMatches = $oSb.RegexMatch($sPattern,$oJson,$iTimeoutMs)
If ($iNumMatches < 0) Then
    ;  Probably an error in the regular expression.
    ;  Suggestion: Use AI to help create and/or diagnose regular expressions.
    ConsoleWrite($oSb.LastErrorText & @CRLF)
    Exit
EndIf

;  Examine the matches:
ConsoleWrite($oJson.Emit() & @CRLF)

;  There are 2 matches:

;  {
;    "named": {
;      "first": 1,
;      "last": 2
;    },
;    "match": [
;      {
;        "group": [
;          {
;            "cap": "John Anders",
;            "idx": 0,
;            "len": 11
;          },
;          {
;            "cap": "John",
;            "idx": 0,
;            "len": 4
;          },
;          {
;            "cap": "Anders",
;            "idx": 5,
;            "len": 6
;          }
;        ]
;      },
;      {
;        "group": [
;          {
;            "cap": "Mary Robins",
;            "idx": 19,
;            "len": 11
;          },
;          {
;            "cap": "Mary",
;            "idx": 19,
;            "len": 4
;          },
;          {
;            "cap": "Robins",
;            "idx": 24,
;            "len": 6
;          }
;        ]
;      }
;    ]
;  }

;  To replace capture groups, write code to examine each capture group within
;  each match, and provide a replacement string.
;  Then call RegexReplace.

;  For example, let's capitalize the first names, and add append "on" to the last name.
;  After doing replacements, we should get:  JOHN Anderson, +_+_+ MARY Robinson $$$$

Local $iFirstNameIdx = $oJson.IntOf("named.first")
Local $iLastNameIdx = $oJson.IntOf("named.last")

$oSbTemp = ObjCreate("Chilkat.StringBuilder")

Local $i = 0
$iNumMatches = $oJson.SizeOfArray("match")
While $i < $iNumMatches

    $oJson.I = $i

    ;  The replacement string for the first name will be all uppercase.
    $oJson.J = $iFirstNameIdx
    $oSbTemp.Clear 
    $oJson.StringOfSb("match[i].group[j].cap",$oSbTemp)
    $oSbTemp.ToUppercase()
    $oJson.UpdateSb("match[i].group[j].rep",$oSbTemp)

    ;  Append "on" to the last name.
    $oJson.J = $iLastNameIdx
    $oSbTemp.Clear 
    $oJson.StringOfSb("match[i].group[j].cap",$oSbTemp)
    $oSbTemp.Append("on")
    $oJson.UpdateSb("match[i].group[j].rep",$oSbTemp)

    $i = $i + 1
Wend

;  The JSON now has replacement strings:
ConsoleWrite($oJson.Emit() & @CRLF)

;  {
;    "named": {
;      "first": 1,
;      "last": 2
;    },
;    "match": [
;      {
;        "group": [
;          {
;            "cap": "John Anders",
;            "idx": 0,
;            "len": 11
;          },
;          {
;            "cap": "John",
;            "idx": 0,
;            "len": 4,
;            "rep": "JOHN"
;          },
;          {
;            "cap": "Anders",
;            "idx": 5,
;            "len": 6,
;            "rep": "Anderson"
;          }
;        ]
;      },
;      {
;        "group": [
;          {
;            "cap": "Mary Robins",
;            "idx": 19,
;            "len": 11
;          },
;          {
;            "cap": "Mary",
;            "idx": 19,
;            "len": 4,
;            "rep": "MARY"
;          },
;          {
;            "cap": "Robins",
;            "idx": 24,
;            "len": 6,
;            "rep": "Robinson"
;          }
;        ]
;      }
;    ]
;  }

;  Call RegexReplace to update the StringBuilder with the replacements.
$bSuccess = $oSb.RegexReplace($oJson)
If ($bSuccess = False) Then
    ConsoleWrite($oSb.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Result after doing replacements:" & @CRLF)
ConsoleWrite($oSb.GetAsString() & @CRLF)

;  Result after doing replacements:
;  JOHN Anderson, +_+_+ MARY Robinson $$$$