Part II: Core ActionScript 3.0 Data Types in Java

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Part II: Core ActionScript 3.0 Data Types
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Metacharacters and Metasequences Demysti ed
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You may see the words metacharacter and metasequence when reading about regular expressions. These terms sound fairly impressive, but they have a simple meaning. Both of these terms refer to any part of the pattern that has a special meaning in regular-expressionspeak. A metacharacter is one single character that is not interpreted literally, such as *, whereas a metasequence is a sequence of characters that is not interpreted literally, such as \s or [a-z]. The asterisk does not mean match an asterisk, and \n does not mean match a backslash followed by the letter n. Escaped characters, therefore, are one kind of metasequence.
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Character Classes
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Regular expressions allow you to conveniently match a whole set of possible characters with a single metasequence. Several sequences look like escaped characters but actually represent a whole range of characters. You already used a character class to match a phone number. Let s look at this expression in a little more detail:
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var phoneNumberPattern:RegExp = /\d\d\d-\d\d\d-\d\d\d\d/;
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Each instance of \d matches any single digit, meaning that except for the dashes, every character in the match must be a 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9. You can easily remember this sequence because d is for digit. If you want to nd any character that s not a digit, you can use the inverse of that character class, \D. The lowercase version matches digits; the uppercase matches nondigits. There are three helpful shorthand character classes: \d for digits, \w for alphanumeric word characters, and \s for whitespace. Each of these has a capitalized version for its inverse: \D for nondigits, \W for nonword characters, and \S for nonwhitespace. The details of these are summarized in Table 12-2. You can also create your own groups of character classes. Simply place the letters that you want to match inside square brackets:
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trace("the cat sat on the mat".match(/[msc]at/g)); //cat,sat,mat
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You don t need to separate the letters with anything, and their order doesn t matter. Keep in mind that even though the metasequence for the character class ([msc]) is longer than one character, it matches one character. It says look for a character that is in this group. You can also specify ranges of characters with the dash character (-), and you can have multiple ranges in one character class. Furthermore, you can combine ranges with single characters:
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trace("abcdefghijklmnopqrstuvwxyz".match(/[a-cmx-z]/g)); //a,b,c,m,x,y,z
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Finally, you can invert a character class by using a caret (^) immediately after the open bracket ([). The whole sequence, then, matches a character that is not in the speci ed set:
trace("roger dodger".match(/[^oge\s]/g)); //r,r,d,d,r
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12: Regular Expressions
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In the preceding snippet, you nd any letter that is not an o, g, e, or any kind of whitespace. Notice that you used a shorthand character class inside a character class. This, too, is possible. When typing character sets, some characters must be escaped. Because the characters [, -, and ] have special meaning in character classes, if you want to include these in a set, you must escape them. The caret may be included literally without escaping as long as it does not appear rst.
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TABLE 12-2
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Character Classes
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Character Meaning
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[...] [^...] [x-y] \w \W \s \S \d \D .
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A character in the set (...). A character not in the set (...). Any character that lies between x and y, inclusive. Word characters. Equivalent to [a-zA-Z0-9_]. Nonword characters. Equivalent to [^a-zA-Z0-9_]. Whitespace characters: tab, space, newline, carriage return. Equivalent to [\t\n\r\ ] (note the space before the right bracket). Nonwhitespace characters. Equivalent to [^\t\n\r\ ]. Decimal digit characters. Equivalent to [0-9]. Nondigit characters. Equivalent to [^0-9]. Any character.
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Regular expressions allow you to specify not just kinds of characters that match, but how many of them to match. Matching a speci c number of characters is a useful ability, as is the ability to discard arbitrary amounts of noise between two items you are interested in matching.