How to implement a regular expression toolbox using Vue?

As a powerful pattern matching tool, regular expressions (Regular Expression) are widely used in scenarios such as text processing and form validation. In front-end development based on Vue, we often need to use regular expressions to complete some tasks, such as form validation, string processing, etc.

In order to use regular expressions more conveniently, we can integrate it into our Vue application by encapsulating a regular expression toolbox component. This article will introduce how to use Vue to implement a simple regular expression toolbox, and provide some sample code to help readers get started quickly.

Implementation ideas

The regular expression toolbox needs to have the following functions:

• Support users to input regular expressions and target strings;
• Displays regular expression matching results and provides optional global matching, ignoring case and other options;
• Provides commonly used regular expression templates and predefined replacement rules;
• supports user customization Replacement rules.

In order to achieve these functions, we need to use Vue’s component development capabilities and regular expression API.

Specifically, we can think of the entire toolbox as a Vue component, which contains a form component, a result list component, a tab component (for switching regular expression templates and replacement rules), and Some basic components such as buttons and input boxes. In the component, we can call the regular expression API to match and replace by listening to events such as user input and options, and display matching details based on the results.

Sample code

The following is a simple implementation example of the Vue regular expression toolbox. The specific timing needs to be adjusted based on actual project needs.

Regular expression component

The regular expression component mainly includes a text input box and a drop-down box for selecting commonly used regular expression templates.

<template>
  <div class="regex-component">
    <input type="text" placeholder="请输入正则表达式" v-model="regex">
    <select v-model="template" @change="applyTemplate">
      <option v-for="(value, name) in templates" :value="value">{{ name }}</option>
    </select>
  </div>
</template>

<script>
export default {
  name: 'RegexComponent',
  props: {
    value: String, // 当前正则表达式
  },
  data() {
    return {
      regex: this.value || '', // 当前正则表达式
      template: '', // 当前选择的模板名称
      templates: { // 常用正则表达式模板
        '整数': '^\d+$',
        '浮点数': '^\d+(\.\d+)?$',
        '电子邮箱': '^\w+([-+.]w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$',
      },
    };
  },
  methods: {
    // 应用选择的模板
    applyTemplate() {
      this.regex = this.templates[this.template] || '';
      this.$emit('input', this.regex);
    },
  },
};
</script>

<style scoped>
.regex-component {
  display: flex;
  align-items: center;
}

select {
  margin-left: 10px;
}
</style>

Result list component

The result list component is mainly used to display regular matching results. It accepts an array of strings as a match result and iterates through the displayed list items.

<template>
  <div>
    <h2>{{title}}</h2>
    <ul>
      <li v-for="(item, index) in items" :key="index">{{item}}</li>
      <li v-if="items.length === 0">无匹配结果</li>
    </ul>
  </div>
</template>

<script>
export default {
  name: 'ResultListComponent',
  props: {
    title: String, // 列表标题
    items: Array, // 列表项
  },
};
</script>

Tab component

The tab component is used to display regular expression templates and replacement rules.

<template>
  <div>
    <ul>
      <li :class="{'active': mode === 'pattern'}" @click="setMode('pattern')">正则表达式模板</li>
      <li :class="{'active': mode === 'replace'}" @click="setMode('replace')">替换规则</li>
    </ul>
    <div v-show="mode === 'pattern'">
      <slot name="templates"></slot>
    </div>
    <div v-show="mode === 'replace'">
      <slot name="replace-rules"></slot>
    </div>
  </div>
</template>

<script>
export default {
  name: 'TabComponent',
  data() {
    return {
      mode: 'pattern', // 当前选中的选项卡
    };
  },
  methods: {
    // 切换选项卡
    setMode(mode) {
      this.mode = mode;
    },
  },
};
</script>

<style scoped>
ul {
  display: flex;
  justify-content: space-around;
  list-style: none;
  padding: 0;
  margin: 0;
}

li {
  cursor: pointer;
}

li.active {
  color: #f00;
}
</style>

Complete regular expression toolbox component

Finally, we combine the above components to implement a complete regular expression toolbox component and export it for use by other Vue components. In the implementation, we will use the RegExp constructor and the match() and replace() methods on the String prototype to do the matching and replacement.

<template>
  <div class="regex-toolbox">
    <RegexComponent v-model="pattern"></RegexComponent>
    <textarea rows="10" placeholder="请输入目标字符串" v-model="target"></textarea>
    <TabComponent>
      <template v-slot:templates>
        <ul>
          <li v-for="(pattern, name) in predefinedPatterns" :key="name">
            <a href="#" @click.prevent="applyPattern(pattern)">{{ name }}</a>
          </li>
        </ul>
      </template>
      <template v-slot:replace-rules>
        <div>
          <p>查找：</p>
          <input type="text" v-model="search" placeholder="请输入查找内容"/>
          <p>替换为：</p>
          <input type="text" v-model="replace" placeholder="请输入替换内容"/>
        </div>
      </template>
    </TabComponent>
    <button @click="doMatch">匹配</button>
    <button @click="doReplace">替换</button>
    <ResultListComponent title="匹配结果" :items="matches"></ResultListComponent>
    <ResultListComponent title="替换结果" :items="replacements"></ResultListComponent>
  </div>
</template>

<script>
import RegexComponent from './RegexComponent';
import TabComponent from './TabComponent';
import ResultListComponent from './ResultListComponent';

export default {
  name: 'RegexToolbox',
  components: {
    RegexComponent,
    TabComponent,
    ResultListComponent,
  },
  data() {
    return {
      pattern: '', // 当前正则表达式
      target: '', // 当前目标字符串
      options: { // 匹配选项
        global: false,
        ignoreCase: false,
      },
      predefinedPatterns: { // 常用正则表达式模板
        '整数': '^\d+$',
        '浮点数': '^\d+(\.\d+)?$',
        '电子邮箱': '^\w+([-+.]w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$',
      },
      search: '', // 查找内容
      replace: '', // 替换内容
      matches: [], // 匹配结果
      replacements: [], // 替换结果
    };
  },
  methods: {
    // 应用预定义的正则表达式模板
    applyPattern(pattern) {
      this.pattern = pattern;
    },

    // 匹配目标字符串
    doMatch() {
      const regex = new RegExp(this.pattern, this.options.ignoreCase ? 'gi' : 'g');
      this.matches = this.target.match(regex) || [];
    },

    // 替换目标字符串
    doReplace() {
      const regex = new RegExp(this.search, this.options.ignoreCase ? 'gi' : 'g');
      this.replacements = this.target.replace(regex, this.replace).split('
');
    },
  },
  watch: {
    pattern() {
      this.doMatch();
    },
  },
};
</script>

<style scoped>
.regex-toolbox {
  display: flex;
  flex-direction: column;
  align-items: center;
}

textarea {
  margin: 10px 0;
  width: 100%;
}

button {
  margin: 10px;
}

.result-list-component {
  margin-top: 20px;
}
</style>

Summary

This article introduces how to use Vue to implement a simple regular expression toolbox. By encapsulating components and calling the regular expression API, it provides a more convenient way for front-end developers. , fast regular expression processing method. I hope this article can help readers better understand Vue component development and the use of regular expressions, and improve work efficiency in actual development.

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