vrl 0.32.0

Vector Remap Language
Documentation 
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{
  "anchor": "sieve",
  "name": "sieve",
  "category": "String",
  "description": "Keeps only matches of `pattern` in `value`.\n\nThis can be used to define patterns that are allowed in the string and\nremove everything else.",
  "arguments": [
    {
      "name": "value",
      "description": "The original string.",
      "required": true,
      "type": [
        "string"
      ]
    },
    {
      "name": "permitted_characters",
      "description": "Keep all matches of this pattern.",
      "required": true,
      "type": [
        "regex"
      ]
    },
    {
      "name": "replace_single",
      "description": "The string to use to replace single rejected characters.",
      "required": false,
      "type": [
        "string"
      ],
      "default": ""
    },
    {
      "name": "replace_repeated",
      "description": "The string to use to replace multiple sequential instances of rejected characters.",
      "required": false,
      "type": [
        "string"
      ],
      "default": ""
    }
  ],
  "return": {
    "types": [
      "string"
    ]
  },
  "examples": [
    {
      "title": "Keep only lowercase letters",
      "source": "sieve(\"vector.dev/lowerUPPER\", permitted_characters: r'[a-z]')",
      "return": "vectordevlower"
    },
    {
      "title": "Sieve with regex",
      "source": "sieve(\"test123%456.فوائد.net.\", r'[a-z0-9.]')",
      "return": "test123456..net."
    },
    {
      "title": "Custom replacements",
      "source": "sieve(\"test123%456.فوائد.net.\", r'[a-z.0-9]', replace_single: \"X\", replace_repeated: \"<REMOVED>\")",
      "return": "test123X456.<REMOVED>.net."
    }
  ],
  "pure": true
}