如何在Mongoose中使用validator验证字段仅含字母数字与空格

你的问题出在validator.isAlphanumeric默认只匹配字母和数字，不包含空格。可以通过两种方式解决：

方案1：使用validator.js的ignore参数 #

isAlphanumeric方法支持传入ignore选项，指定要允许的额外字符，这里传入空格即可：

const productSchema = new mongoose.Schema({
  title: {
    type: String,
    required: [true, 'A product must have a Title Bro...'],
    trim: true,
    validate: [
      {
        validator: function(v) {
          return validator.isAlphanumeric(v, 'en-US', { ignore: ' ' });
        },
        message: 'Only alphanumeric characters and spaces are accepted'
      }
    ],
    maxlength: [50, 'the title must have less or equal than 50 characters'],
    minlength: [5, 'the title must have more or equal than 5 characters']
  }
})

方案2：自定义正则表达式验证 #

如果觉得validator.js的参数不够直观，也可以直接用正则表达式匹配字母数字和空格：

const productSchema = new mongoose.Schema({
  title: {
    type: String,
    required: [true, 'A product must have a Title Bro...'],
    trim: true,
    validate: [
      {
        validator: function(v) {
          return /^[a-zA-Z0-9\s]+$/.test(v);
        },
        message: 'Only alphanumeric characters and spaces are accepted'
      }
    ],
    maxlength: [50, 'the title must have less or equal than 50 characters'],
    minlength: [5, 'the title must have more or equal than 5 characters']
  }
})

说明 #

• 正则^[a-zA-Z0-9\s]+$表示：从开头到结尾，只能包含大小写字母、数字和空格，且至少有一个字符。
• 两种方案都能实现需求，可根据习惯选择。

内容的提问来源于stack exchange，提问作者Kiarash P