curl --request POST \
  --url https://api.iotools.cloud/v1/tool/java-regex-tester \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "pattern": "(?<user>\\w+)@(?<domain>[\\w.]+)",
  "mode": "find",
  "testString": "Contact: hello@example.com, support@iotools.cloud",
  "replacement": "${domain}:${user}"
}
'

{
  "tool": "java-regex-tester",
  "tool_version": "1.0.2",
  "outputs": {
    "summary": "2 matches found.",
    "matches": [
      {
        "match": "1",
        "matched-text": "hello@example.com",
        "start": "9",
        "end": "26",
        "capture-groups": "1 (user): hello | 2 (domain): example.com"
      },
      {
        "match": "2",
        "matched-text": "support@iotools.cloud",
        "start": "28",
        "end": "49",
        "capture-groups": "1 (user): support | 2 (domain): iotools.cloud"
      }
    ],
    "replaced": "Contact: example.com:hello, iotools.cloud:support",
    "javaCode": "Pattern pattern = Pattern.compile(\"(?<user>\\\\w+)@(?<domain>[\\\\w.]+)\");"
  },
  "credits_used": 5,
  "credits_remaining": null
}