Node.js

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

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var sb = new chilkat.StringBuilder();
    sb.Append(subject);

    var json = new chilkat.JsonObject();
    json.EmitCompact = false;

    var timeoutMs = 2000;
    var 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.
        console.log(sb.LastErrorText);
        return;
    }

    //  Examine the matches:
    console.log(json.Emit());

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

    var sbTemp = new chilkat.StringBuilder();

    var i = 0;
    numMatches = json.SizeOfArray("match");
    while (i < 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:
    console.log(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 == false) {
        console.log(sb.LastErrorText);
        return;
    }

    console.log("Result after doing replacements:");
    console.log(sb.GetAsString());

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

}

chilkatExample();