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We have marked a number of topics in this chapter as New! with an icon in the book margin Here is a summary of the most important new high-level user interface features of MIDP 20 described in this chapter Classes TextBox and TextField have been improved to better control the display and input behavior by: adding the ability to set a hint for the initial input character set from an extensible set of Unicode subsets (see the setInitialInputMode method),

e* or e{0,} Nongreedily match zero or more occurrences of expression e e{m} e{m,} e{m,} e{,n} e{,n} e{m,n} e{m,n}

Note that using the attribute in this manner to enable exception detail will override any other settings in the con guration that may be intended to disable the feature Therefore, we recommend you use a con gurationbased approach for production applications, perhaps reserving the attribute usage for development purposes Whether you elect con guration- or attribute-based use of this feature, remember to disable the option when you do not actively require the details to be transmitted Using this option only when necessary will help you to ensure that sensitive service details are not exposed

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It is often possible to convert * uses to + uses and vice versa For example, we could match tasselled with at least one l using tassell*ed or tassel+ed, and match those with two or more ls using tasselll*ed or tassell+ed If we use the regex \d+ it will match 136 But why does it match all the digits, rather than just the rst one By default, all quanti ers are greedy they match as many characters as they can We can make any quanti er nongreedy (also called minimal) by following it with a symbol (The question mark has two different meanings on its own it is a shorthand for the {0,1} quanti er, and when it follows a quanti er it tells the quanti er to be nongreedy) For example, \d+ can match the string 136 in three different places: 136, 136, and 136 Here is another example: \d matches zero or one digits, but prefers to match none since it is nongreedy on its own it suffers the same problem as * in that it will match nothing, that is, any text at all Nongreedy quanti ers can be useful for quick and dirty XML and HTML parsing For example, to match all the image tags, writing <img*> (match one < , then one i , then one m , then one g , then zero or more of any character apart from newline, then one > ) will not work because the * part is greedy and will match everything including the tag s closing >, and will keep going until it reaches the last > in the entire text

Three solutions present themselves (apart from using a proper parser) One is <img[^>]*> (match <img, then any number of non-> characters and then the tag s closing > character), another is <img* > (match <img, then any number of characters, but nongreedily, so it will stop immediately before the tag s closing >, and then the >), and a third combines both, as in <img[^>]* > None of them is correct, though, since they can all match <img>, which is not valid Since we know that an image tag must have a src attribute, a more accurate regex is <img\s+[^>]* src=\w+[^>]* > This matches the literal characters <img, then one or more whitespace characters, then nongreedily zero or more of anything except > (to skip any other attributes such as alt), then the src attribute (the literal characters src= then at least one word character), and then any other non-> characters (including none) to account for any other attributes, and nally the closing >

adding a constraint to restrict the input of decimal numbers, including decimal point fraction digits (see the setConstraints method with the DECIMAL constraint),

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