我有一个包含许多分散文件路径的大文件，看起来像
lolsed_bulsh.png
我想在扩展路径前添加这些文件名，如：
/full/path/lolsed_bullsh.png
我很难匹配和捕捉这些。目前我正在尝试各种变体：
cat myfile.txt| sed s/\(.+\)\.png/\/full\/path\/\1/g | ack /full/path
我认为sed有一些正则表达式或捕获组行为我不理解
答案 0 :(得分：19)
使用<div class="clear">First name:<br>
<input type="text" name="firstname"><br>
</div>
+
*打印：
sed -E "s/(.*)\.png/\/full\/path\/\1/g" <<< "lolsed_bulsh.png"
注意： 非标准 /full/path/lolsed_bulsh
选项是为了避免转义-E和(
答案 1 :(得分：7)
package com.betech.bbqv2.jsonparse;
import android.app.ActionBar;
import com.betech.bbqv2.login.AndroidPHPConnectionDemo;
import com.betech.bbqv2.main.AddActivity;
import com.betech.bbqv2.main.CheckLogin;
import com.betech.bbqv2.main.DataListView;
import com.betech.bbqv2.main.MainActivity;
import com.betech.bbqv2.main.OrderHistory;
import com.betech.bbqv2.R;
import com.betech.bbqv2.main.SingleContactActivity;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.List;
import org.json.JSONObject;
import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class countrymain extends Activity {
ListView mListView;
private String catid;
private String companycode="bbq";
private SharedPreferences loginPreferences;
private SharedPreferences.Editor loginPrefsEditor;
private SharedPreferences tmploginPreferences;
private SharedPreferences.Editor tmploginPrefsEditor;
String matchguest="";
private ActionBar actionBar;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// requestWindowFeature(Window.FEATURE_NO_TITLE);
// getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.country_main);
actionBar = getActionBar();
actionBar.show();
getActionBar().setIcon(R.drawable.actionbar_icon);
getActionBar().setDisplayShowTitleEnabled(false);
loginPreferences = getSharedPreferences("loginPrefs", MODE_PRIVATE);
loginPrefsEditor = loginPreferences.edit();
tmploginPreferences = getSharedPreferences("tmploginPrefs", MODE_PRIVATE);
tmploginPrefsEditor = tmploginPreferences.edit();
String login1 = loginPreferences.getString("username", "");
String login2 = tmploginPreferences.getString("tmpusername", "");
String match="nomatch";
login1=login1.toLowerCase();
login2=login2.toLowerCase();
if(login1.equalsIgnoreCase("guest") || login2.equalsIgnoreCase("guest")){
matchguest="guest";
}else{
matchguest="noguest";
}
catid=getIntent().getExtras().getString("cat");
String strUrl = "http://myweb/bbq/mobile.php?catid="+catid+"&matchguest="+matchguest;
DownloadTask downloadTask = new DownloadTask();
// Starting the download process
downloadTask.execute(strUrl);
// Getting a reference to ListView of activity_main
mListView = (ListView) findViewById(R.id.lv_countries);
mListView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//Open the browser here
HashMap<String,Object> map = (HashMap<String, Object>) parent.getItemAtPosition(position);
TextView foodcode = ((TextView) mListView.findViewById(R.id.foodcode));
TextView foodname = ((TextView) mListView.findViewById(R.id.foodname));
TextView fooddesc1 = ((TextView) mListView.findViewById(R.id.fooddesc1));
TextView fooddesc2 = ((TextView) mListView.findViewById(R.id.fooddesc2));
TextView foodprice = ((TextView) mListView.findViewById(R.id.foodprice));
// Toast.makeText(countrymain.this, "label is="+map.get("country")
// , Toast.LENGTH_SHORT).show();
// Toast.makeText(countrymain.this, "label is="+quantity.getText().toString()
//, Toast.LENGTH_SHORT).show();
//TextView quantity = ((TextView) v.findViewById(R.id.value));
Intent in = new Intent(getApplicationContext(),
SingleContactActivity.class);
in.putExtra("foodcode", map.get("foodcode").toString());
in.putExtra("foodname", map.get("foodname").toString());
in.putExtra("fooddesc1", map.get("fooddesc1").toString());
in.putExtra("fooddesc2", map.get("fooddesc2").toString());
in.putExtra("foodprice", map.get("foodprice").toString());
in.putExtra("imagepath", map.get("flag_path").toString());
startActivity(in);
}
});
// public void onItemClick(AdapterView<?> parent, View v,
// int position, long id) {
// mListView.setOnItemClickListener(new OnItemClickListener() {
// public void onItemClick(AdapterView adapterView, View view, int position, long id) {
// SimpleAdapter adapter = (SimpleAdapter) adapterView.getAdapter();
// ListView currentLv = (ListView) view;
// Object item = adapter.getItem(position);
//Do some more stuff here and launch new activity
//}
//});
}
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
///////////////////////////////Newly added
int responseCode = urlConnection.getResponseCode();
String responseMessage = urlConnection.getResponseMessage();
// InputStream is = null;
Log.d("response code=",String.valueOf(responseCode));
if (responseCode >= 400) {
iStream = urlConnection.getErrorStream();
} else {
//is = urlConnection.getInputStream();
iStream = urlConnection.getInputStream();
}
/////////////////////////////////////////////////
// Reading data from url
// iStream = urlConnection.getInputStream();<---original
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
}
return data;
}
/** AsyncTask to download json data */
private class DownloadTask extends AsyncTask<String, Integer, String>{
String data = null;
@Override
protected String doInBackground(String... url) {
try{
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
@Override
protected void onPostExecute(String result) {
// The parsing of the xml data is done in a non-ui thread
ListViewLoaderTask listViewLoaderTask = new ListViewLoaderTask();
// Start parsing xml data
listViewLoaderTask.execute(result);
}
}
/** AsyncTask to parse json data and load ListView */
private class ListViewLoaderTask extends AsyncTask<String, Void, SimpleAdapter>{
JSONObject jObject;
// Doing the parsing of xml data in a non-ui thread
@Override
protected SimpleAdapter doInBackground(String... strJson) {
try{
//Toast.makeText(countrymain.this, "URL="+strJson[0], Toast.LENGTH_SHORT).show();
jObject = new JSONObject(strJson[0]);
CountryJSONParser countryJsonParser = new CountryJSONParser();
countryJsonParser.parse(jObject);
}catch(Exception e){
Log.d("JSON Exception1",e.toString());
}
// Instantiating json parser class
CountryJSONParser countryJsonParser = new CountryJSONParser();
// A list object to store the parsed countries list
List<HashMap<String, Object>> countries = null;
try{
// Getting the parsed data as a List construct
countries = countryJsonParser.parse(jObject);
}catch(Exception e){
Log.d("Exception",e.toString());
}
// Keys used in Hashmap
//String[] from = { "country","flag","details"};
String[] from = { "foodcode","foodname","fooddesc1","fooddesc2","foodprice","flag"};
// Ids of views in listview_layout
// int[] to = { R.id.tv_country,R.id.iv_flag,R.id.tv_country_details};
int[] to = { R.id.foodcode,R.id.foodname,R.id.fooddesc1, R.id.fooddesc2,R.id.foodprice,R.id.iv_flag};
// Instantiating an adapter to store each items
// R.layout.listview_layout defines the layout of each item
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), countries, R.layout.lv_layout, from, to);
// CheckLogin checknow = new CheckLogin ();
// String guestnot=checknow.checklogin();
// Log.d("Match=",guestnot);
// if(guestnot.equals("match")){
//
//}
return adapter;
}
/** Invoked by the Android on "doInBackground" is executed */
@Override
protected void onPostExecute(SimpleAdapter adapter) {
// Setting adapter for the listview
mListView.setAdapter(adapter);
// Toast.makeText(countrymain.this, "label is="+adapter.getCount()
// , Toast.LENGTH_SHORT).show();
for(int i=0;i<adapter.getCount();i++){
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(i);
String imgUrl = (String) hm.get("flag_path");
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
HashMap<String, Object> hmDownload = new HashMap<String, Object>();
hm.put("flag_path",imgUrl);
hm.put("position", i);
// Starting ImageLoaderTask to download and populate image in the listview
imageLoaderTask.execute(hm);
}
}
}
/** AsyncTask to download and load an image in ListView */
private class ImageLoaderTask extends AsyncTask<HashMap<String, Object>, Void, HashMap<String, Object>>{
@Override
protected HashMap<String, Object> doInBackground(HashMap<String, Object>... hm) {
InputStream iStream=null;
String imgUrl = (String) hm[0].get("flag_path");
int position = (Integer) hm[0].get("position");
URL url;
try {
url = new URL(imgUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
// Getting Caching directory
File cacheDirectory = getBaseContext().getCacheDir();
// Temporary file to store the downloaded image
File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"+position+".jpg");
// The FileOutputStream to the temporary file
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Creating a bitmap from the downloaded inputstream
Bitmap b = BitmapFactory.decodeStream(iStream);
// Writing the bitmap to the temporary file as png file
b.compress(Bitmap.CompressFormat.PNG,100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
//Close the FileOutputStream
fOutStream.close();
// Create a hashmap object to store image path and its position in the listview
HashMap<String, Object> hmBitmap = new HashMap<String, Object>();
// Storing the path to the temporary image file
hmBitmap.put("flag",tmpFile.getPath());
// Storing the position of the image in the listview
hmBitmap.put("position",position);
// Returning the HashMap object containing the image path and position
return hmBitmap;
}catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(HashMap<String, Object> result) {
// Getting the path to the downloaded image
String path = (String) result.get("flag");
// Getting the position of the downloaded image
int position = (Integer) result.get("position");
// Getting adapter of the listview
SimpleAdapter adapter = (SimpleAdapter ) mListView.getAdapter();
// Getting the hashmap object at the specified position of the listview
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(position);
// Overwriting the existing path in the adapter
hm.put("flag",path);
// Noticing listview about the dataset changes
adapter.notifyDataSetChanged();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
//menuInflater.inflate(R.layout.menu, menu);
menuInflater.inflate(R.menu.activity_main_actions, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId()) {
// action with ID action_refresh was selected
case R.id.action_setting1s:
Intent m= new Intent(getApplicationContext(),MainActivity.class);
startActivity(m);
break;
// action with ID action_settings was selected
case R.id.action_setting2s:
Intent j = new Intent(getApplicationContext(),DataListView.class);
startActivity(j);
break;
case R.id.action_setting3s:
// Toast.makeText(this, "Settings selected", Toast.LENGTH_SHORT)
// .show();
Intent k = new Intent(getApplicationContext(),OrderHistory.class);
startActivity(k);
break;
case R.id.action_setting4s:
// Toast.makeText(this, "Settings selected", Toast.LENGTH_SHORT)
// .show();
Intent intent = new Intent(getApplicationContext(),AndroidPHPConnectionDemo.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
// moveTaskToBack(true);
// android.os.Process.killProcess(android.os.Process.myPid());
//System.exit(0);
break;
default:
break;
}
return true;
} }
使用POSIX BRE和BRE doesn't support one or more quantifier +。量词sed仅为supported in POSIX ERE。但是，POSIX sed uses BRE and has no option to switch to ERE。
如果您想保持可移植性，请使用+模拟..*。
或者，如果您可以假设代码始终在GNU sed上运行，则可以使用GNU扩展.+。或者，您也可以使用GNU扩展.\+标志切换到POSIX ERE。 higuaro's answer中的-r标记为an undocumented flag for compatibility with BSD sed，效果相同。
答案 2 :(得分：2)
通过选择不同的分隔符（和-E选项）来节省一些转义，例如：
cat myfile.txt | sed -E "s|(..*)\.png|/full/path/\1|g" | ack /full/path