from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(
    q: str | None = Query(
        default=None, min_length=3, max_length=50, pattern="^fixedquery$"
    ),
):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

from typing import Annotated

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(
    q: Annotated[str | None, Query(title="Query string", min_length=3)] = None,
):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

async def read_items(
    q: Annotated[
        str | None,
        Query(
            title="Query string",
            description="Query string for the items to search in the database that have a good match",
            min_length=3,
        ),
    ] = None,
):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

        str | None,
        Query(
            alias="item-query",
            title="Query string",
            description="Query string for the items to search in the database that have a good match",
            min_length=3,
            max_length=50,
            pattern="^fixedquery$",
            deprecated=True,
        ),
    ] = None,
):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:

## Mehr Validierungen hinzufügen { #add-more-validations }

Sie können auch einen `min_length`-Parameter hinzufügen:

{* ../../docs_src/query_params_str_validations/tutorial003_an_py310.py hl[10] *}

## Reguläre Ausdrücke hinzufügen { #add-regular-expressions }

## Adicione mais validações { #add-more-validations }

Você também pode adicionar um parâmetro `min_length`:

{* ../../docs_src/query_params_str_validations/tutorial003_an_py310.py hl[10] *}

## Adicione expressões regulares { #add-regular-expressions }

  <suppress files="modules[/\\]lang-painless[/\\]src[/\\]test[/\\]java[/\\]org[/\\]elasticsearch[/\\]painless[/\\]ContextExampleTests.java" checks="LineLength" />

  <!--
    Truly temporary suppressions suppression of snippets included in
    documentation that are so wide that they scroll.
  -->

`Annotated` birden fazla metadata anotasyonu alabildiği için, artık aynı fonksiyonu [Typer](https://typer.tiangolo.com/) gibi başka araçlarla da kullanabilirsiniz. 🚀

## Daha fazla doğrulama ekleyin { #add-more-validations }

`min_length` parametresini de ekleyebilirsiniz:

{* ../../docs_src/query_params_str_validations/tutorial003_an_py310.py hl[10] *}

## Regular expression ekleyin { #add-regular-expressions }

## Ajouter plus de validations { #add-more-validations }

Vous pouvez également ajouter un paramètre `min_length` :

{* ../../docs_src/query_params_str_validations/tutorial003_an_py310.py hl[10] *}

## Ajouter des expressions régulières { #add-regular-expressions }

## Agregar más validaciones { #add-more-validations }

También puedes agregar un parámetro `min_length`:

{* ../../docs_src/query_params_str_validations/tutorial003_an_py310.py hl[10] *}

## Agregar expresiones regulares { #add-regular-expressions }