PowerShell

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

PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

$success = $false

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

$sb = New-Object Chilkat.StringBuilder
$sb.Append($subject)

$json = New-Object Chilkat.JsonObject
$json.EmitCompact = $false

$timeoutMs = 2000
$numMatches = $sb.RegexMatch($pattern,$json,$timeoutMs)
if ($numMatches -lt 0) {
    # Probably an error in the regular expression.
    # Suggestion: Use AI to help create and/or diagnose regular expressions.
    $($sb.LastErrorText)
    exit
}

# Examine the matches:
$($json.Emit())

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

$sbTemp = New-Object Chilkat.StringBuilder

$i = 0
$numMatches = $json.SizeOfArray("match")
while ($i -lt $numMatches) {

    $json.I = $i

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

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

    $i = $i + 1
}

# The JSON now has replacement strings:
$($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 -eq $false) {
    $($sb.LastErrorText)
    exit
}

$("Result after doing replacements:")
$($sb.GetAsString())

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