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

## Add regular expressions { #add-regular-expressions }

You can define a <abbr title="A regular expression, regex or regexp is a sequence of characters that define a search pattern for strings.">regular expression</abbr> `pattern` that the parameter should match:

{* ../../docs_src/query_params_str_validations/tutorial004_an_py310.py hl[11] *}

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.regex.Matcher;

import org.apache.maven.RepositoryUtils;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.factory.ArtifactFactory;

    additionalLabels: {}
    annotations: {}
    # for node metrics
    relabelConfigs: {}
    # for cluster metrics
    relabelConfigsCluster:
      {}
      # metricRelabelings:
      #   - regex: (server|pod)
      #     action: labeldrop
    namespace: ~
    # Scrape interval, for example `interval: 30s`
    interval: ~
    # Scrape timeout, for example `scrapeTimeout: 10s`
    scrapeTimeout: ~

import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.function.Consumer;
import java.util.function.Supplier;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;

import org.apache.maven.model.Activation;
import org.apache.maven.model.Build;
import org.apache.maven.model.BuildBase;

import com.google.common.testing.SerializableTester;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.regex.Pattern;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@link Doubles}.
 *
 * @author Kevin Bourrillion
 */

HSPLkotlin/text/MatcherMatchResult$groups$1;-><init>(Lkotlin/text/MatcherMatchResult;)V
HSPLkotlin/text/MatcherMatchResult;-><init>(Ljava/util/regex/Matcher;Ljava/lang/CharSequence;)V
HSPLkotlin/text/MatcherMatchResult;->getRange()Lkotlin/ranges/IntRange;
HSPLkotlin/text/Regex;-><init>(Ljava/lang/String;)V
HSPLkotlin/text/Regex;->matches(Ljava/lang/CharSequence;)Z
HSPLkotlin/text/StringsKt__StringNumberConversionsKt;->toIntOrNull(Ljava/lang/String;)Ljava/lang/Integer;

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

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

Sie können einen <abbr title="Ein regulärer Ausdruck, regex oder regexp genannt, ist eine Sequenz von Zeichen, die ein Suchmuster für Zeichenfolgen definiert.">regulären Ausdruck</abbr> `pattern` definieren, mit dem der Parameter übereinstimmen muss:

* However, when a Markdown document is translated, the `#hash-parts` in links to its headings may change. Update these links if possible.
    * Search for such links in the translated document using the regex `#[^# ]`.
    * Search in all documents already translated into your language for `your-translated-document.md`. For example VS Code has an option "Edit" -> "Find in Files".

          "value": "$__all"
        },
        "label": "Data source",
        "name": "DS_PROMETHEUS",
        "options": [],
        "query": "prometheus",
        "refresh": 1,
        "regex": "",
        "type": "datasource"
      },
      {
        "current": {
          "selected": false,
          "text": "All",
          "value": "$__all"
        },
        "datasource": {

<a href="https://fastapi.tiangolo.com/zh/tutorial/">教程 - 用户指南</a> 中有包含更多特性的更完整示例。

**剧透警告**： 教程 - 用户指南中的内容有：

* 对来自不同地方的参数进行声明，如：**请求头**、**cookies**、**form 表单**以及**上传的文件**。
* 如何设置**校验约束**如 `maximum_length` 或者 `regex`。
* 一个强大并易于使用的 **<abbr title="也被称为 components, resources, providers, services, injectables">依赖注入</abbr>** 系统。
* 安全性和身份验证，包括通过 **JWT 令牌**和 **HTTP 基本身份认证**来支持 **OAuth2**。
* 更进阶（但同样简单）的技巧来声明 **多层嵌套 JSON 模型** （借助 Pydantic）。