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Manipulating Strings
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Now that we ve seen the fundamentals of atomic values, let s move on to look at how to actually use them. First up is the most common kind of atomic value in XML: strings. There are lots of functions for manipulating strings within XPath, for example, allowing you to break up strings, to combine them together, and to reformat them. Several of these functions have been added between XPath 1.0 and XPath 2.0, including functions that support matching and replacing based on regular expressions. XSLT 2.0 also introduces an <xsl:analyze-string> element for regular expression processing.
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Splitting and Recombining Strings
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The substring-before() and substring-after() functions are handy for splitting up characterdelimited strings. They both take two or three arguments, the first being the original string, the second being the character or string at which it should be broken, and the optional third argument being a collation URI.
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Note You learned about collations, which are used to compare strings, in the last chapter.
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CHAPTER 5 MANIPULATING ATOMIC VALUES
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The substring-before() function returns the substring of the first argument before the first occurrence of the second argument, while the substring-after() function returns the substring of the first argument after the first occurrence of the second argument. If the character doesn t appear in the string, then both functions return an empty string. For example, you could use these functions to get someone s forename and surname given just their name: substring-before('Jeni Tennison', ' ') substring-after('Jeni Tennison', ' ') The substring() function is useful when you have strings that follow a fixed-width format. It normally takes three arguments: the original string, the index of the first character in the string that you want (starting from 1), and the number of characters you want to get in the substring. You can omit the third argument to get all the remaining characters in a string. For example, both the following calls return the string 'xyz': substring('abcdefghijklmnopqrstuvwxyz', 24, 3) substring('abcdefghijklmnopqrstuvwxyz', 24)
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Note There s no limit in XPath to the number of characters that a string can contain, though it will be
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limited in particular implementations, or by the memory capacity of the computer on which you re running the transformation. There are limits on the numbers that XPath can handle, since most XPath numbers are double-precision 64-bit floating point numbers. I ve never seen either limit be a real problem.
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When you re trying to get the last part of a string, it s often useful to know the string s length. You can do this with the string-length() function. For example, you can get the last letter in a string with the following: substring($string, string-length($string)) Once you ve broken up a string, you often want to recombine the component parts in a different way. You can do this with the concat() function, which takes two or more string arguments and combines them into a single string. For example, once you ve pulled out the forename and surname from a string, you might want to combine them back together in a sortable format, with the surname first and a comma separator: concat($surname, ', ', $forename) If you have a sequence of strings, such as the values of all the <Name> elements of the <Channel> elements in the TV guide, you can concatenate them together with the string-join() function. The string-join() function takes a sequence of strings as the first argument, and a separator string as the second argument; each string in the sequence is concatenated with the next, with the separator in between. For example, to create a comma-separated list of the channels in our TV guide, we can use string-join(Channel/Name, ', ')
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Summary You can split up a string with the substring(), substring-before(), and substring-after()
functions. The string-length()
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