Xojo Plugin

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

Xojo Plugin

Dim success As Boolean
success = False

success = False

Dim subject As String
subject = "John Anders, +_+_+ Mary Robins $$$$"
Dim pattern As String
pattern = "\w+\s+\w+"

Dim sb As New Chilkat.StringBuilder
success = sb.Append(subject)

Dim json As New Chilkat.JsonObject
json.EmitCompact = False

Dim timeoutMs As Int32
timeoutMs = 2000
Dim numMatches As Int32
numMatches = sb.RegexMatch(pattern,json,timeoutMs)
If (numMatches < 0) Then
    // Probably an error in the regular expression.
    // Suggestion: Use AI to help create and/or diagnose regular expressions.
    System.DebugLog(sb.LastErrorText)
    Return
End If

// Examine the matches:
System.DebugLog(json.Emit())

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

Dim sbTemp As New Chilkat.StringBuilder

Dim i As Int32
i = 0
numMatches = json.SizeOfArray("match")
While i < numMatches

    json.I = i

    // The full match is always in group 0.
    sbTemp.Clear 
    success = json.StringOfSb("match[i].group[0].cap",sbTemp)

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

    i = i + 1
Wend

// The JSON now has replacement strings:
System.DebugLog(json.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.
success = sb.RegexReplace(json)
If (success = False) Then
    System.DebugLog(sb.LastErrorText)
    Return
End If

System.DebugLog("Result after doing replacements:")
System.DebugLog(sb.GetAsString())

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