CkPython Requires Chilkat v11.1.0+

Regular Expression with Multiple Matches and Capture Groups

See more Regular Expressions Examples

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

CkPython

import sys
import chilkat

success = False

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

sb = chilkat.CkStringBuilder()
crlf = True
sb.AppendLine("Name: John Smith, Email: john.smith@example.com",crlf)
sb.AppendLine("Name: Jack Johnson, Email: jack.johnson@example.com",crlf)
sb.AppendLine("Name: Mary Adams, Email: mary.adams@example.com",crlf)

print(sb.getAsString())

#  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

json = chilkat.CkJsonObject()
json.put_EmitCompact(False)

timeoutMs = 2000
numMatches = sb.RegexMatch(pattern,json,timeoutMs)
if (numMatches < 0):
    #  Probably an error in the regular expression.
    #  Suggestion: Use AI to help create and/or diagnose regular expressions.
    print(sb.lastErrorText())
    sys.exit()

#  Examine the matches:
print(json.emit())

#  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")
while i < matchCount :
    print("Match " + str(i + 1) + ":")
    json.put_I(i)
    j = 0
    numCaptureGroups = json.SizeOfArray("match[i].group")
    while j < numCaptureGroups :
        json.put_J(j)
        cap = json.stringOf("match[i].group[j].cap")
        print(str(j) + ": " + cap)
        j = j + 1

    i = i + 1

#  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.com