vrl 0.32.0

Vector Remap Language
Documentation 
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{
  "anchor": "starts_with",
  "name": "starts_with",
  "category": "String",
  "description": "Determines whether `value` begins with `substring`.",
  "arguments": [
    {
      "name": "value",
      "description": "The string to search.",
      "required": true,
      "type": [
        "string"
      ]
    },
    {
      "name": "substring",
      "description": "The substring that the `value` must start with.",
      "required": true,
      "type": [
        "string"
      ]
    },
    {
      "name": "case_sensitive",
      "description": "Whether the match should be case sensitive.",
      "required": false,
      "type": [
        "boolean"
      ],
      "default": "true"
    }
  ],
  "return": {
    "types": [
      "boolean"
    ]
  },
  "examples": [
    {
      "title": "String starts with (case sensitive)",
      "source": "starts_with(\"The Needle In The Haystack\", \"The Needle\")",
      "return": true
    },
    {
      "title": "String starts with (case insensitive)",
      "source": "starts_with(\"The Needle In The Haystack\", \"the needle\", case_sensitive: false)",
      "return": true
    },
    {
      "title": "String starts with (case sensitive failure)",
      "source": "starts_with(\"foobar\", \"F\")",
      "return": false
    }
  ],
  "pure": true
}