Visual FoxPro

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

Visual FoxPro

LOCAL lnSuccess
LOCAL lcSubject
LOCAL lcPattern
LOCAL loSb
LOCAL loJson
LOCAL lnTimeoutMs
LOCAL lnNumMatches
LOCAL loSbTemp
LOCAL i

lnSuccess = 0

lnSuccess = 0

lcSubject = "John Anders, +_+_+ Mary Robins $$$$"
lcPattern = "\w+\s+\w+"

loSb = CreateObject('Chilkat.StringBuilder')
loSb.Append(lcSubject)

loJson = CreateObject('Chilkat.JsonObject')
loJson.EmitCompact = 0

lnTimeoutMs = 2000
lnNumMatches = loSb.RegexMatch(lcPattern,loJson,lnTimeoutMs)
IF (lnNumMatches < 0) THEN
    * Probably an error in the regular expression.
    * Suggestion: Use AI to help create and/or diagnose regular expressions.
    ? loSb.LastErrorText
    RELEASE loSb
    RELEASE loJson
    CANCEL
ENDIF

* Examine the matches:
? loJson.Emit()

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

loSbTemp = CreateObject('Chilkat.StringBuilder')

i = 0
lnNumMatches = loJson.SizeOfArray("match")
DO WHILE i < lnNumMatches

    loJson.I = i

    * The full match is always in group 0.
    loSbTemp.Clear()
    loJson.StringOfSb("match[i].group[0].cap",loSbTemp)

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

    i = i + 1
ENDDO

* The JSON now has replacement strings:
? loJson.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.
lnSuccess = loSb.RegexReplace(loJson)
IF (lnSuccess = 0) THEN
    ? loSb.LastErrorText
    RELEASE loSb
    RELEASE loJson
    RELEASE loSbTemp
    CANCEL
ENDIF

? "Result after doing replacements:"
? loSb.GetAsString()

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

RELEASE loSb
RELEASE loJson
RELEASE loSbTemp