Selected Characters Character in Java

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Table 128
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Selected Characters Character
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x \\ \t \n \r \f
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Matches The non-metacharacter x The backslash as non-metacharacter The tab character ('\u0009') The newline (line feed) character ('\u000A') The carriage-return character ('\u000D') The form-feed character ('\u000C')
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Character Classes
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The notation [] can be used to define a pattern that represents a set of characters, called a character class Table 129 shows examples of such patterns A ^ character is interpreted as a metacharacter when specified immediately after the [ character In this context, it negates all the characters in the set Anywhere else in the [] construct, it is a non-metacharacter The pattern [^aeiouAEIOU] represents the set of all characters that excludes all vowels, ie, it matches any character that is not a vowel
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556 Index: Target: Pattern: Match:
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CHAPTER 12: LOCALIZATION, PATTERN MATCHING, AND FORMATTING 012345678901 I said I am [^aeiouAEIOU] (1,1: )(2,2:s)(5,5:d)(6,6: )(8,8: )(10,10:m)(11,11:)
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The - character is used to specify intervals inside the [] notation If the interval cannot be determined for a - character, it is treated as a non-metacharacter For example, in the pattern [-A-Z], the first - character is interpreted as a non-metacharacter, but the second occurrence is interpreted as a metacharacter that represents an interval
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Index: Target: Pattern: Match: 0123456789012 I-love-REGEX [-A-Z] (0,0:I)(1,1:-)(6,6:-)(7,7:R)(8,8:E)(9,9:G)(10,10:E)(11,11:X)
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Except for the \ metacharacter which retains its meaning, the other metacharacters $, , , *, +, (, ) and | are recognized as non-metacharacters in a [] construct
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Table 129
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Selected Character Classes Character Classes
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[abc] [^abc] [a-zA-Z] [a-d[m-p]] [a-z&&[def]] [a-z&&[^bc]] [a-z&&[^m-p]]
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Matches
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a, b, or c (simple
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class)
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Any character except a, b, or c (negation)
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a through z or A through Z, inclusive (range) a through d, or m through p, ie, [a-dm-p] (union) d, e, or f (intersection) a through z, except for b and c, ie, [ad-z] (subtraction) a through z, and not m through p,
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ie, [a-lq-z] (subtraction)
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Predefined Character Classes
Table 1210 shows a shorthand for writing some selected character classes Note that a character class matches one single character at a time in the output, and not a sequence of characters (unless it has only one character) The metacharacter should be paid special attention to, as it will match one occurrence of any single character
Index: Target: Pattern: Match: 0123456789012345678901234567890123456789012345678901234567890 Who is who Whose is it To whom it may concern How are you [Hh]o (0,2:Who)(7,9:who)(12,14:Who)(28,30:who)(48,50: Ho)
Here is another example, using a predefined character class in a pattern to recognize a date or time format:
126: STRING PATTERN MATCHING USING REGULAR EXPRESSIONS Index: Target: Pattern: Match: Table 1210 012345678901234567890 01-03-49 786 09-09-09 \d\d-\d\d-\d\d (0,7:01-03-49)(13,20:09-09-09)
Selected Predefined Character Classes Pre-defined Character Classes
\d \D \s \S \w \W
Matches Any character (may also match a line terminator) A digit, ie, [^0-9] A non-digit, ie, [^\d] A whitespace character, ie, [ \t\n\x0B\f\r] A non-whitespace character, ie, [^\s] A word character, ie, [a-zA-Z_0-9] A non-word character: [^\w]
Boundary Matchers
Sometimes we are interested in finding a pattern match at either the beginning or the end of a string/line This can be achieved by using boundary matchers (also called anchors), as shown in Table 1211 Here is an example of a simple pattern to determine if the input ends in a character We have to escape the character in order to use it as a non-metacharacter in the pattern Note that, except for the character at the end of the input, the other characters in the input are not recognized
Index: Target: Pattern: Match: Table 1211 01234567890123456789012345678 Who is who Who me Who else \ $ (28,28: )
Boundary Matchers Boundary Matcher
^R R$
Matches (R is a regular expression)
Anchoring at the beginning of a string/line Anchoring at the end of a string/line
CHAPTER 12: LOCALIZATION, PATTERN MATCHING, AND FORMATTING
Logical Operators
Table 1212 shows logical operators that we can use to create more complex regular expressions The logical operators are shown in increasing order of precedence, analogous to the logical operators in boolean expressions Here is an example that uses all three logical operators for recognizing any case-insensitive occurrence of Java or C++ in the input:
Index: Target: Pattern: Match: 01234567890123456789012345678901 JaVA jAvA C++ jAv c+++1 javan C+ ([Jj][aA][vV][aA])|([Cc]\+\+) (0,3:JaVA)(5,8:jAvA)(10,12:C++)(18,20:c++)(24,27:java)