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| Developed by | Guardrails AI |
| Date of development | Feb 15, 2024 |
| Validator type | Format |
| Blog | |
| License | Apache 2 |
| Input/Output | Output |
This validator ensures that a generated output contains a url.
$ guardrails hub install hub://guardrails/has_url
In this example, we apply the validator to a string output generated by an LLM.
# Import Guard and Validator
from guardrails.hub import HasUrl
from guardrails import Guard
# Setup Guard
guard = Guard().use(
HasUrl
)
guard.validate("guardrailsai.com") # Validator passes
guard.validate("https://not-a-url") # Validator fails
In this example, we apply the validator to a string field of a JSON output generated by an LLM.
from pydantic import BaseModel, Field
from guardrails.hub import HasUrl
from guardrails import Guard
# Initialize Validator
val = HasUrl()
# Create Pydantic BaseModel
class LlmInteraction(BaseModel):
prompt: str
response: str = Field(validators=[val])
# Create a Guard to check for valid Pydantic output
guard = Guard.from_pydantic(output_class=LlmInteraction)
# Run LLM output generating JSON through guard
res = guard.parse("""
{
"prompt": "Can you find the Guardrails docs for me?",
"response": "Sure! Here's the link to the Guardrails docs: https://guardrailsai.com/docs"
}
""")
print(res.validated_output)
__init__(self, on_fail="noop")
Initializes a new instance of the HasUrl class.
Parameters
on_fail (str, Callable): The policy to enact when a validator fails. If str, must be one of reask, fix, filter, refrain, noop, exception or fix_reask. Otherwise, must be a function that is called when the validator fails.validate(self, value, metadata) -> ValidationResult
Validates the given value using the rules defined in this validator, relying on the metadata provided to customize the validation process. This method is automatically invoked by guard.parse(...), ensuring the validation logic is applied to the input data.
Note:
guard.parse(...) where this method will be called internally for each associated Validator.guard.parse(...), ensure to pass the appropriate metadata dictionary that includes keys and values required by this validator. If guard is associated with multiple validators, combine all necessary metadata into a single dictionary.Parameters
value (Any): The input value to validate.The validator playground is available to authenticated users. Please log in to use it.