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What"s New & Changed in Java Generation pdf417 2d barcode in Java What"s New & Changed




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CHAPTER 10 What"s New & Changed using none toincoporate none for asp.net web,windows application ISO Standards Overview Changes to the repl none none ace() Method of String Object Syntax for JavaScript 1.3:. anyString.replace(r egularExpression, "newSubString"); anyString.replace(regularExpression, myFunction);.

JavaScript 1.2 Syntax:. anyString.replace(r egularExpression, "newSubString");. Parameters Defined:. As of JavaScript 1. 3, the replace() Method can optionally use a Function for the myFunction Argument instead of only being able to provide a replacement SubString, as in version 1.2 of JavaScript.

All of the previous functionality of the replace() Method is retained from JavaScript 1.2 and won"t be reiterated here. If you need to refresh your memory, check back in 8 on Strings on pages 778-781.

However, some of the essential details should be at your fingertips, so here"s a quick reminder about replace(), before we get into the intricacies of the myFunction Argument. The replace() Method finds a match between the regularExpression Argument and the calling String anyString. Then the SubString contained in the newSubString Argument is used to replace the SubString that is matched in anyString.

However, it should be noted that the replace() Method does not alter the original calling String anyString in any way. It returns a new String consisting of anyString with the matched substitutions. The newSubString Argument can be a Literal, a Variable name, or any of the following RegExp Properties, which are defined in 9.

Note that $1 - $9 are not prepended with RegExp when used in the newSubString Argument in the replace() Method and must be inside quotes. This is true only when using the replace() Method. $1, $2, .

.., $9 lastMatch, lastParen, leftContext, rightContext, Not prepended with RegExp and must be inside quotes Is prepended with RegExp, outside quotes with String addition + Is prepended with RegExp, outside quotes with String addition + Is prepended with RegExp, outside quotes with String addition + Is prepended with RegExp, outside quotes with String addition +.

$& $+ $` $". The regularExpressi on Argument can be a Literal or a Variable name. The global flag g can be used to execute a global search and the ignore case flag i can be used to execute a case-insensitive search. They can be used individually or together as gi.

. Part III J a v a S c r i p t 1 . 3 Parameters Defined (continued):. That"s it for the r none none eview. Let"s move on to the myFunction Argument. When you specify a Function for the second Argument in replace(), (the myFunction Argument), it is invoked after the match between regularExpression and anyString has executed.

The myFunction Function is used to dynamically generate the replacement SubString by using the return Statement to return the results to the replace() Method as the conclusion to the Function call. Before we go any further, let"s do a more detailed delineation of the Syntax for the myFunction Argument..

Syntax for JavaScript 1.3:. anyString.replace(r none for none egularExpression, function myFunction(fullMatchedSubString, rememberedSubStr1, rememberedSubStr2, ..

., rememberedSubStr9, ) { Statements; return replacementSubString; } );. Parameters Defined (continued):. When the myFunction none none Function is specified, its first Argument of fullMatchedSubString is always the holder of the complete SubString match from the regularExpression Argument. The next Argument of myFunction is rememberedSubStr1 and contains the first parenthesized remembered SubString. The rest of the possible Arguments hold the rest of the parenthesized remembered SubStrings as they occur in order from 2 to 9.

The Statements parameters are any valid JavaScript Statements to execute in order to manipulate the matched SubString and its remembered SubStrings into a final replacementSubString, which is then returned via the return Statement. The replacementSubString is the SubString that replaces the match found in the calling anyString. Within the myFunction Function, that is, any of the Statements contained within the Function, may make use of the Array returned from the exec() Method of the RegExp Object.

What this means is that you can use the RegExp Properties of $1-$9 to access the parenthesized remembered SubStrings in an efficient manner to massage the replacement String before returning it. You may also use the RegExp Property of input. See 9 on pages 803-807 for more information on RegExp Properties.

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