String starts with

Input

value

Validate that value starts with 'HELLO'

validation:

stringStartsWith

Ensure string field starts with specified prefix

source:value

parameters

prefix

Prefix that the field must start with

Output

result
Pass
Pass
Pass
String field "value" does not start with "HELLO"
String field "value" does not start with "HELLO"
String field "value" does not start with "HELLO"

* Sample inputs run locally in your browser using the same operation logic as Fontana Flow.
Results are illustrative, not connected to a workflow.

Ensure string field starts with specified prefix.

Parameters

• prefix (string, optional) — Prefix that the field must start with. Examples: "https://", "US", "ID-".

Field selection

• source — Field whose values this operation reads. Use a single field name, a comma-separated list of plain field paths (cash_flow_type, currency) from the multi-select UI, or a regex via Pattern mode. Omit to apply to all fields on the row.
• target — Optional output field. When omitted, the source field is updated in place. Hidden when more than one named source field is selected.

JSON Configuration

{
  "id": "op-stringStartsWith",
  "type": "validation",
  "action": "stringStartsWith",
  "params": {
    "prefix": "HELLO"
  },
  "testInputs": [
    "HELLO WORLD",
    "HELLO!",
    "HELLO there",
    "goodbye",
    "world",
    "zzhello"
  ]
}

Related

• required