Ruby

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

Ruby

require 'chilkat'

success = false

success = false

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

sb = Chilkat::CkStringBuilder.new()
sb.Append(subject)

json = Chilkat::CkJsonObject.new()
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() + "\n";
    exit
end

# Examine the matches:
print json.emit() + "\n";

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

sbTemp = Chilkat::CkStringBuilder.new()

i = 0
numMatches = json.SizeOfArray("match")
while i < numMatches

    json.put_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
end

# The JSON now has replacement strings:
print json.emit() + "\n";

# {
#   "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)
    print sb.lastErrorText() + "\n";
    exit
end

print "Result after doing replacements:" + "\n";
print sb.getAsString() + "\n";

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