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XQuery by Priscilla Walmsley

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Concatenating and Splitting Strings

Five functions, summarized in Table 17-6, concatenate and split apart strings.

Table 17-6. Functions that concatenate and split apart strings

Name

Description

concat

Concatenates two or more strings

string-join

Concatenates a sequence of strings, optionally using a separator

tokenize

Breaks a single string into a sequence of strings, using a specified separator

codepoints-to-string

Converts a sequence of Unicode code-point values to a string

string-to-codepoints

Converts a string to a sequence of Unicode code-point values

Concatenating Strings

Strings can be concatenated together using one of two functions: concat or string-join. XQuery does not allow use of concat operators such as +, &, or || to concatenate strings. The concat function accepts individual string arguments and concatenates them together. This function is unique in that it accepts a variable number of arguments. For example:

concat("a", "b", "c")

returns the string abc. The string-join function, on the other hand, accepts a sequence of strings. For example:

string-join( ("a", "b", "c"), "")

also returns the string abc. In addition, string-join allows a separator to be passed as the second argument. For example:

string-join( ("a", "b", "c"), "/")

returns the string a/b/c.

Splitting Strings Apart

Strings can be split apart, or tokenized, using the tokenize function. This function breaks a string into a sequence of strings, using a regular expression to designate ...

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