普通的前pressions和中国

问题描述

我有一个数据库查询，根据用户的输入，但是，如果用户输入的搜索应用程序的任何一个普通的字母会崩溃。但随着搜索还支持中国字我不能简单的块中的所有一个字符搜索。

我将如何写一个正前pression检查一个英文字符，但不包括一个中国字？ ^（A-ZA-Z）{1} $，^ \\ w {1} $做这些只包括英文字母？

我想使用常规的前pression这样的，但没有更好的办法将AP preciated：

 如果（input.matches（^（A-ZA-Z）{1} $）
{
  //显示错误
}
其他
{
 //做查询
}
 

解决方案

您一定要首先解决的崩溃。英语和中国（中日韩）字符之间的区别，您可以使用字符类，如 \\ p {ASCII} ， \\ p {字母} 为ASCII和 \\ p {InCJKUnifiedIdeographs} 适用于CJK字符。

I have a database query based on user input, However if the user inputs any one common letter in the search the app will crash. but as the search also supports Chinese characters I can't simple block all one character searches.

How would I write a regular expression to check for a single English character but will not include a single Chinese characters? "^(a-zA-Z){1}$" "^\w{1}$" do these include only english letters??

I'm thinking of using the regular expression like this, but any better solutions would be appreciated:

if(input.matches("^(a-zA-Z){1}$")
{
  //Show error
}
else
{
 //do query
}

解决方案

You should definitely fix any crashes first. To distinguish between English and Chinese (CJK) characters, you can use character classes such as \p{ASCII}, \p{Alpha} for ASCII and \p{InCJKUnifiedIdeographs} for CJK characters.

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