java 使用 Android 模式和匹配器类（正则表达式）
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/34893068/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Using Android Pattern and Matcher class (Regex)
提问by Daniel Louis
I have just picked up Android, but am tasked to help with a project for my internship.
我刚刚开始学习 Android，但我的任务是帮助我的实习项目。
Lets say I have the details below:
假设我有以下详细信息：
Fonia Taylo
Product Manager
[email protected]
98706886
From the details I have above, I want to pass it into a class whereby I can then filter out the email address using regex, and pass onlythis filtered out email address to an EditText.
根据我上面的详细信息，我想将它传递给一个类，然后我可以使用正则表达式过滤掉电子邮件地址，并且只将这个过滤掉的电子邮件地址传递给 EditText。
I have searched many tutorials on regex, especially on Android Pattern and Matcher classes.
我搜索了很多关于正则表达式的教程，尤其是关于 Android Pattern 和 Matcher 类的教程。
But all the examples I have found are only for validation for the text entered into an EditText field only.
但是我发现的所有示例仅用于验证输入到 EditText 字段中的文本。
What I need to do is:
我需要做的是：
- Validate the entire text as shown above
- Filter out the email address using the regex (and delete the rest of the text)
- Pass onlythis email address to an EditText
- 验证整个文本，如上所示
- 使用正则表达式过滤掉电子邮件地址（并删除其余文本）
- 仅将此电子邮件地址传递给 EditText
Currently below is my class:
目前以下是我的班级：
public class RegexOCR1 extends Activity {
private Pattern pattern;
private Matcher matcher;
private String recognizedText, textToUse;
private static final String EMAIL_PATTERN =
"^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@"
+ "[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_createcontact);
// Getting the path of the image from another class
Bundle extras = this.getIntent().getExtras();
recognizedText = extras.getString("TEXT");
textToUse = recognizedText;
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
setContentView(R.layout.usetext);
showText();
//Log.i(TAG, "onConfigChanged");
}
private void showText(){
//Log.i(TAG, "ShowText");
Intent intent = new Intent(this, CreateContactActivityOCR.class);
startActivity(intent);
}
public EmailValidator() {
Pattern pattern = Pattern.compile(EMAIL_PATTERN);
Matcher matcher = pattern.matcher(textToUse);
if (matcher.find())
{
String email = textToUse.substring(matcher.start(), matcher.end());
} else {
// TODO handle condition when input doesn't have an email address
}
}
public boolean validate(final String hex) {
matcher = pattern.matcher(hex);
return matcher.matches();
}
}
As you can see, it is pretty much incomplete. I would like to pass "textToUse" into the regex validation, and then continue to perform the function as stated above.
如您所见，它几乎不完整。我想将“textToUse”传递到正则表达式验证中，然后继续执行上述功能。
Edit:
编辑：
After the following method:
经过以下方法：
public EmailValidator() {
Pattern pattern = Pattern.compile(EMAIL_PATTERN);
Matcher matcher = pattern.matcher(textToUse);
if (matcher.find())
{
String email = textToUse.substring(matcher.start(), matcher.end());
} else {
// TODO handle condition when input doesn't have an email address
}
}
which extract out the email address; How do I then pass this extracted email address to through intent to an EditTextthat is in another Class?
提取电子邮件地址；我如何再经过意图通过这个提取电子邮件地址，向EditText上是在另一个类？
Please let me know you how I can change my code if there are any ideas. Thank you!
如果有任何想法，请告诉我如何更改我的代码。谢谢！
回答by kris larson
Here is some code to extract the text matching the pattern:
下面是一些提取与模式匹配的文本的代码：
Pattern pattern = Pattern.compile(EMAIL_PATTERN);
Matcher matcher = pattern.matcher(inputString);
if (matcher.find()) {
String email = inputString.substring(matcher.start(), matcher.end());
} else {
// TODO handle condition when input doesn't have an email address
}
回答by frogatto
In Android SDK, there is class called android.util.Patterns, in which you can find various useful regex patterns.
在 Android SDK 中，有一个名为 的类android.util.Patterns，您可以在其中找到各种有用的正则表达式模式。
E-Mail Address:
android.util.Patterns.EMAIL_ADDRESS
电子邮件地址：
android.util.Patterns.EMAIL_ADDRESS
Then you can simply use them like this:
然后你可以像这样简单地使用它们：
String target = "";
if(android.util.Patterns.EMAIL_ADDRESS.matcher(target).matches()){
}
回答by NEC
Simply first you download the Web content to your android studio log by creating a separated class as following :
首先，通过创建一个单独的类，将 Web 内容下载到您的 android studio 日志，如下所示：
public class MainActivity extends AppCompatActivity {
公共类 MainActivity 扩展 AppCompatActivity {
public class DownloadTsk extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
int data = reader.read();
while (data != -1) {
char current = (char) data;
result += current;
data = reader.read();
}
return result;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
Then you use this class in onCreate method and download the content ==> test it in Log and Finally you use Pattern and Matcher like following:
然后你在 onCreate 方法中使用这个类并下载内容 ==> 在 Log 中测试它，最后你使用 Pattern 和 Matcher，如下所示：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DownloadTsk task = new DownloadTsk();
String result = null;
try {
result = task.execute("YOUR WEBSITE ADDRESS..... ").get();
Log.i("Content", result);
} catch (Exception e) {
e.printStackTrace();
}
Pattern p = Pattern.compile("WHTEEVER BEFORE(.*?)WHTEEVER AFTER ");
Matcher m = p.matcher(result);
while (m.find()) {
Log.i("result", m.group(1)) ;
}
}
