в 09:19, 26 мая 2010

2010-05-26T09:19:12Z

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2010-05-26T08:14:34Z

1 версия

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==Find all the occurrences of a substring.==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var sTitle:String = new String("ActionScript Bible");
var nMatch:Number = sTitle.indexOf("i");
while(nMatch != -1) {
trace(nMatch);
nMatch = sTitle.indexOf("i", nMatch + 1);
}

}
}
}
3
9
14
</source>

==Finding Substrings==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var sTitle:String = new String("ActionScript");
trace(sTitle.indexOf("ActionScript"));
trace(sTitle.indexOf("i"));
trace(sTitle.lastIndexOf("i"));
trace(sTitle.indexOf("i", 4));
trace(sTitle.lastIndexOf("i", 12));
trace(sTitle.indexOf("q"));
trace(sTitle.lastIndexOf("g"));

}
}
}
0
3
9
9
9
-1
-1
</source>

==Is indexOf case sensitive==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var example:String = "Cool. This is a cool as both cool (lowercase) and Cool.";

var search:String = "cool";

trace( example.indexOf( search ) );

}
}
}
</source>

==Returns everything before the last period, if any.==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
trace( removeExtension( "document.jpg" ) ); // Displays: document
trace( removeExtension( "document" ) ); // Displays: document
trace( removeExtension( "document.1.jpg" ) ); // Displays: document.1
trace( extractExtension( "document.jpg" ) ); // Displays: .jpg
trace( extractExtension( "document" ) ); // Displays nothing
trace( extractExtension( "document.1.jpg" ) ); // Displays: .jpg

}
private function removeExtension( filename:String ):String {
var extensionIndex:Number = filename.lastIndexOf( "." );
if ( extensionIndex == -1 ) {
return filename;
} else {
return filename.substr( 0, extensionIndex );
}
}

private function extractExtension( filename:String ):String {
var extensionIndex:Number = filename.lastIndexOf( "." );
if ( extensionIndex == -1 ) {
return "";
} else {
return filename.substr( extensionIndex + 1, filename.length );
}
}
}
}
</source>

==Searching for a Substring==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var example:String = "This string contains the word cool twice. Very cool.";
var index:int = example.indexOf( "cool" );
if ( index != -1 ) {
trace( "String contains word cool at index " + index );
}
}
}
}
</source>

==Use indexOf and lastIndexOf to locate specific string==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var sEmail:String = new String("info@your.ru");

var nCheckOne:Number = sEmail.indexOf("@");
var nCheckTwo:Number = sEmail.lastIndexOf(".");
if (nCheckOne!= -1 && nCheckTwo!= -1 && nCheckOne < nCheckTwo){
trace("good email address");
}
}
}
}
</source>

==Use indexOf( ) in a while statement to get the indices of every occurrence of a substring==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var example:String = "This string contains the word cool. Very cool. Yes, cool.";
var index:int = -1;
while ( ( index = example.indexOf( "cool", index + 1 ) ) != -1 ) {

trace( "String contains word cool at index " + index );
}
}
}
}
</source>

==Use indexOf in while loop to count the instance of a substring==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){

var story:String = "It was a dark and stormy night...";
var pattern:String = "a";
var count:int = 0;
var startIndex:int = 0;
while (story.indexOf(pattern, startIndex) != -1) {
count++;
startIndex = story.indexOf(pattern, startIndex) + 1;
}
trace(count);
}
}
}
</source>

==Use indexOf to check the existance of an substring==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var sTitle:String = new String("ActionScript Demo");
var nIndex:Number = sTitle.indexOf("Script");
if(nIndex != -1) {
trace("substring was found");
}
}
}
}
</source>

==Use lastIndexOf to search string==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var example:String = "This string contains the word cool twice. Very cool.";

var index:int = example.lastIndexOf( "cool" );

if ( index != -1 ) {
trace( "String contains word cool at index " + index );
}
index = example.lastIndexOf( "cool", index - 1 );

if ( index != -1 ) {
trace( "String contains word cool at index " + index );
}
}
}
}
</source>

==Use offset index in indexOf method to search substring==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var example:String = "This string contains the word cool twice. Very cool.";
var index:int = example.indexOf( "cool" );

if ( index != -1 ) {
trace( "String contains word cool at index " + index );
}

index = example.indexOf( "cool", index + 1 );

if ( index != -1 ) {
trace( "String contains word cool at index " + index );
}
}
}
}
</source>

==Use offset in lastIndexOf method==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var example:String = "This string contains the word cool. Very cool. Yes, cool.";

var index:int = example.length;

while ( ( index = example.lastIndexOf( "cool", index - 1 ) ) != -1 ) {
trace( "String contains word cool at index " + index );
}
}
}
}
</source>

==Use the lastIndexOf method to get the file extension name==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var filename:String = "document.jpg";
var extensionIndex:Number = filename.lastIndexOf( "." );

var extension:String = filename.substr( extensionIndex + 1, filename.length );
trace( "The file extension is " + extension );
}
}
}
</source>

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Flash / Flex / ActionScript/String/indexOf lastIndexOf - История изменений

в 09:19, 26 мая 2010

Admin: 1 версия