Classic ASP
Regular Expression with Multiple Matches and Capture Groups

Demonstrates a regular expression with multiple matches and capture groups for each match.
Note: Chilkat uses PCRE2. See PCRE2 Regular Expressions
Also see: PCRE2 Performance
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Classic ASP
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

pattern = "Name:\s+(\w+)\s+(\w+),\s+Email:\s+(\S+)"

set sb = Server.CreateObject("Chilkat.StringBuilder")
crlf = 1
success = sb.AppendLine("Name: John Smith, Email: john.smith@example.com",crlf)
success = sb.AppendLine("Name: Jack Johnson, Email: jack.johnson@example.com",crlf)
success = sb.AppendLine("Name: Mary Adams, Email: mary.adams@example.com",crlf)

Response.Write "<pre>" & Server.HTMLEncode( sb.GetAsString()) & "</pre>"

' We have the following string:
' Name: John Smith, Email: john.smith@example.com
' Name: Jack Johnson, Email: jack.johnson@example.com
' Name: Mary Adams, Email: mary.adams@example.com

set json = Server.CreateObject("Chilkat.JsonObject")
json.EmitCompact = 0

timeoutMs = 2000
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.
    Response.Write "<pre>" & Server.HTMLEncode( sb.LastErrorText) & "</pre>"
    Response.End
End If

' Examine the matches:
Response.Write "<pre>" & Server.HTMLEncode( json.Emit()) & "</pre>"

' This is the JSON with the match information.
' See the JSON parsing code below to get the matched capture group values.

' {
'   "match": [
'     {
'       "group": [
'         {
'           "cap": "Name: John Smith, Email: john.smith@example.com",
'           "idx": 0,
'           "len": 47
'         },
'         {
'           "cap": "John",
'           "idx": 6,
'           "len": 4
'         },
'         {
'           "cap": "Smith",
'           "idx": 11,
'           "len": 5
'         },
'         {
'           "cap": "john.smith@example.com",
'           "idx": 25,
'           "len": 22
'         }
'       ]
'     },
'     {
'       "group": [
'         {
'           "cap": "Name: Jack Johnson, Email: jack.johnson@example.com",
'           "idx": 49,
'           "len": 51
'         },
'         {
'           "cap": "Jack",
'           "idx": 55,
'           "len": 4
'         },
'         {
'           "cap": "Johnson",
'           "idx": 60,
'           "len": 7
'         },
'         {
'           "cap": "jack.johnson@example.com",
'           "idx": 76,
'           "len": 24
'         }
'       ]
'     },
'     {
'       "group": [
'         {
'           "cap": "Name: Mary Adams, Email: mary.adams@example.com",
'           "idx": 102,
'           "len": 47
'         },
'         {
'           "cap": "Mary",
'           "idx": 108,
'           "len": 4
'         },
'         {
'           "cap": "Adams",
'           "idx": 113,
'           "len": 5
'         },
'         {
'           "cap": "mary.adams@example.com",
'           "idx": 127,
'           "len": 22
'         }
'       ]
'     }
'   ]
' }

' Important:  Capture group 0 always contains the entire match — that is, the portion of the input string that matches the full regular expression.

i = 0
matchCount = json.SizeOfArray("match")
Do While i < matchCount
    Response.Write "<pre>" & Server.HTMLEncode( "Match " & i + 1 & ":") & "</pre>"
    json.I = i
    j = 0
    numCaptureGroups = json.SizeOfArray("match[i].group")
    Do While j < numCaptureGroups
        json.J = j
        cap = json.StringOf("match[i].group[j].cap")
        Response.Write "<pre>" & Server.HTMLEncode( j & ": " & cap) & "</pre>"
        j = j + 1
    Loop
    i = i + 1
Loop

' Capture group 0 always contains the entire match — that is, the portion of the input string that matches the full regular expression.

' Output

' Match 1:
' 0: Name: John Smith, Email: john.smith@example.com
' 1: John
' 2: Smith
' 3: john.smith@example.com
' Match 2:
' 0: Name: Jack Johnson, Email: jack.johnson@example.com
' 1: Jack
' 2: Johnson
' 3: jack.johnson@example.com
' Match 3:
' 0: Name: Mary Adams, Email: mary.adams@example.com
' 1: Mary
' 2: Adams
' 3: mary.adams@example.co

%>
</body>
</html>