基于element-ui的rules中正则表达式

<template>
 <el-form :model="unuseForm" label-position="top" :rules="dialogRules">
 <el-form-item label="原因" prop="loseEfficacyReason">
  <el-input type="textarea" v-model="unuseForm.loseEfficacyReason" auto-complete="off"></el-input>
 </el-form-item>
 </el-form>
</template>
<script>
export default{
 data(){
 return {
  dialogRules: {
  loseEfficacyReason: [
   { required: true, message: '请输入原因', trigger: 'blur' },
   { min: 2, message: '请输入不少于2个字符', trigger: 'blur' },
   { pattern: /^[A-Za-z0-9\u4e00-\u9fa5]+$/, message: '不允许输入空格等特殊符号' }
  ]
  }
 }
 }
}
</script>