Regular Expressions in Java

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ranges of characters in them without having to write each character individually We learned how to quantify expressions to match a speci c number of times or to match from a given minimum to a given maximum number of times, and how to use greedy and nongreedy matching We also learned how to group one or more expressions together so that they can be quanti ed (and optionally captured) as a unit The chapter also showed how what is matched can be affected by using various assertions, such as positive and negative lookahead and lookbehind, and by various ags, for example, to control the interpretation of the period and whether to use case-insensitive matching The nal section showed how to put regexes to use within the context of Python programs In this section we learned how to use the functions provided by the re module, and the methods available from compiled regexes and from match objects We also learned how to replace matches with literal strings, with literal strings that contain backreferences, and with the results of function calls or lambda expressions, and how to make regexes more maintainable by using named captures and comments
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1 In many contexts (eg, in some web forms), users must enter a phone number, and some of these irritate users by accepting only a speci c format Write a program that reads US phone numbers with the three-digit area and seven-digit local codes accepted as ten digits, or separated into blocks using hyphens or spaces, and with the area code optionally enclosed in parentheses For example, all of these are valid: 555-123-1234, (555) 1234567, (555) 123 1234, and 5551234567 Read the phone numbers from sysstdin and for each one echo the number in the form (999) 999 9999 or report an error for any that are invalid, or that don t have exactly ten digits The regex to match these phone numbers is about ten lines long (in verbose mode) and is quite straightforward A solution is provided in phonepy, which is about twenty- ve lines long 2 Write a small program that reads an XML or HTML le speci ed on the command line and for each tag that has attributes, outputs the name of the tag with its attributes shown underneath For example, here is an extract from the program s output when given one of the Python documentation s indexhtml les:
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html xmlns = http://wwww3org/1999/xhtml
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meta http-equiv = Content-Type content = text/html; charset=utf-8 li class = right style = margin-right: 10px
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One approach is to use two regexes, one to capture tags with their attributes and another to extract the name and value of each attribute Attribute values might be quoted using single or double quotes (in which case they may contain whitespace and the quotes that are not used to enclose them), or they may be unquoted (in which case they cannot contain whitespace or quotes) It is probably easiest to start by creating a regex to handle quoted and unquoted values separately, and then merging the two regexes into a single regex to cover both cases It is best to use named groups to make the regex more readable This is not easy, especially since backreferences cannot be used inside character classes A solution is provided in extract_tagspy, which is less than 35 lines long The tag and attributes regex is just one line The attribute name value regex is half a dozen lines and uses alternation, conditional matching (twice, with one nested inside the other), and both greedy and nongreedy quanti ers
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BNF Syntax and Parsing Terminology Writing Handcrafted Parsers Pythonic Parsing with PyParsing Lex/Yacc-Style Parsing with PLY
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