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searched contains a series of database commands, then normalizing the commands to a single case may simplify other parts of your program If you only want to replace the first occurrence of a pattern, use replaceFirst( ) rather than replaceAll( ) It is shown here: String replaceFirst(String regExpr, String repStr) The first sequence in the invoking string that matches regExpr will be replaced by repStr A PatternSyntaxException will be thrown if regExpr is invalid Its also possible to use the Java regular expression API to achieve a case-insensitive search and replacement
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Classes javalangString Methods String[ ] split(String regExpr)
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Sometimes you will want to decompose a string into a set of substrings based on some criteria For example, given an e-mail address, you might want to obtain two substrings The first is the name of the addressee; the second is the URL In this case, the separator is the @ In the past, you would have had to manually search for the @ using a method such as indexOf( ) and then use substring( ) to retrieve each part of the address However, beginning with Java 14, a more convenient option became available: split( ) The split( ) method employs a regular expression to provide a very convenient way to decompose a string into a set of substrings in a single step Because the characters that form the delimiters between substrings are specified by a pattern, you can use split( ) to handle some very complicated decomposition problems For example, using split( ), it is easy to obtain a list of the words contained within a string Simply specify a regular expression that matches all non-word characters Many other types of splits are also easy For example, to split a string containing a list of comma-separated values, such as 10, 20, 30, and so on, simply specify a comma as the delimiting expression Whatever your use, split( ) is one of String s most important regular-expression-based methods Once you master it, you will be surprised at how often you use it
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Splitting a string into pieces involves these two steps: 1 Create a regular expression that defines the delimiter that will be used to split the string 2 Call split( ) on the string, passing in the regular expression An array of strings containing the pieces is returned
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The split( ) method defined by String decomposes the invoking string into pieces Where one substring ends and the next begins is determined by a regular expression Thus, the regular expression specifies the delimiters that terminate a substring (The first substring is bounded by the beginning of the string The final substring is bounded by the end of the string) There are two forms of split( ) The one used in the recipe is shown here: String[ ] split(String regExpr) The delimiting expression is specified by regExpr The method returns an array that contains the pieces of the string If no matches with regExpr are found, then the entire string is returned The split( ) method will throw a PatternSyntaxException if regExpr does not contain a valid regular expression When constructing a regular expression for use in split( ) keep in mind that you are defining the pattern that separates one substring from another You are not specifying a pattern that matches the pieces you want For example, given the string This is a test to split this string into words that are separated by spaces, pass the following regular expression to regExpr "\\s+" This results in an array that contains the following substrings: This is a test The final substring "test" includes the period because only spaces match the regular expression However, as explained, the last substring terminates with the end of the input string and does not need to end in a match with the regular expression
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