NOTATION in Java

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NOTATION
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specifies a number with two decimal places, at least one digit to the left of the decimal point, a comma after the thousands digit, and blank-filling up to the ten-thousands (using underplace It would represent 1234567 as 12,34567 and 4 as -----040 scores to stand for blanks) For a full specification, look at the definition of Decimal Format or a spreadsheet program
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92 Regular Expressions
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The format specifiers for pack and unpack are a very simple notation for defining the layout of packets Our next topic is a slightly more complicated but much more expressive notation, regular expressions, which specify patterns of text We've used regular expressions occasionally throughout the book without defining them precisely; they are familiar enough to be understood without much explanation Although regular expressions are pervasive in the Unix programming environment, they are not as widely used in other systems, so in this section we'll demonstrate some of their power In case you don't have a regular expression library handy, we'll also show a rudimentary implementation There are several flavors of regular expressions, but in spirit they are all the same a way to describe patterns of literal characters, along with repetitions, alternatives, and shorthands for classes of characters like digits or letters One familiar example is the so-called "wildcards" used in command-line processors or shells to match patterns of file names Typically a is taken to mean "any string of characters" so, for example, a command like
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C:\> del *exe
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uses a pattern that matches all files whose names consist of any string ending in exeW As is often the case, details differ from system to system, and even from program to program Although the vagaries of different programs may suggest that regular expressions are an ad hoc mechanism, in fact they are a language with a formal grammar and a precise meaning for each utterance in the language Furthermore, the right implementation can run very fast; a combination of theory and engineering practice makes a lot of difference, an example of the benefit of specialized algorithms that we alluded to in 2 A regular expression is a sequence of characters that defines a set of matching strings Most characters simply match themselves, so the regular expression abc will match that string of letters wherever it occurs In addition a few metacharacters indicate repetition or grouping or positioning In conventional Unix regular expressions, A stands for the beginning of a string and $ for the end, so Ax matches an x only at the
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SECTION 92
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REGULAR EXPRESSIONS
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beginning of a string x$ matches an x only at the end, Ax$ matches x only if it is the sole character of the string, and A$ matches the empty string The character " " matches any character, so x y matches xay, x2y and so on, but not xy or xaby, and A $ matches a string with a single arbitrary character A set of characters inside brackets [Imatches any one of the enclosed characters, so [0123456789] matches a single digit; it may be abbreviated [0-91 These building blocks are combined with parentheses for grouping, I for alternatives, a for zero or more occurrences + for one or more occurrences, and for zero or one occurrences Finally, \ is used as a prefix to quote a metacharacter and turn off its special meaning; \a is a literal a and \\ is a literal backslash The best-known regular expression tool is the program grep that we've mentioned several times The program is a marvelous example of the value of notation It applies a regular expression to each line of its input files and prints those lines that contain matching strings This simple specification, plus the power of regular expressions, lets it solve many day-to-day tasks In the following examples, note that the regular expression syntax used in the argument to grep is different from the wildcards used to specify a set of file names; this difference reflects the different uses Which source file uses class Regexp
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