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Ensures that the capacity of a StringBuilder is at least the specified value.
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7. Strings and Regular Expressions
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getChars() indexOf() insert()
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N/A N/A Insert()
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lastIndexOf() length() setLength()
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N/A Length
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replace()
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Numerous overloaded methods insert the string representation of different values at a specified location within a StringBuilder. Unsupported. A property used to get and set the current length of the StringBuilder contents. As with Java, if the new length is shorter than the current contents, the contents will be truncated. If the new length is greater, the end of the string will be padded with spaces. The Java StringBuffer method replaces characters at the specified location range. Overloaded versions of the StringBuilder method replace matching characters or substrings.
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reverse() subSequence() substring() toString()
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N/A N/A N/A ToString()
Returns the current contents of a StringBuilder as a string.
Regular Expressions
The comparison and manipulation features provided by the String and StringBuilder classes are adequate for simple operations. However, when complex string manipulations are required or large amounts of text need to be processed, regular expressions can provide a more efficient solution. Although regular expressions are new to Java version 1.4, many third-party Java regular expression libraries have been available for some time. .NET includes regular expression functionality as part of the standard class libraries in the System.Text.RegularExpressions namespace. The .NET regular expression implementation is refreshingly straightforward and contains some functionality not available in the Java implementation. In the following sections, we'll cover the use of the .NET regular expression classes; where appropriate, we'll contrast them with those provided in Java version 1.4.
Compiling Regular Expressions
The java.util.regex.Pattern class represents a compiled regular expression; the .NET equivalent is System.Text.RegularExpressions.Regex. Whereas Java provides a static factory method for creating Pattern instances, Regex uses a constructor; we contrast these approaches in Table 7-12. Both implementations offer two overload versions with similar signatures and return an immutable representation of a compiled regular expression. The first version takes a string containing a regular expression. The second takes both a regular expression and a bit mask containing compilation flags; we discuss these flags later in this section.
7. Strings and Regular Expressions
Table 7-12. Regular Expression Creation in Java and .NET
java.util.regex.Pattern Pattern.compile(String) Pattern.compile(String, flags)
System.Text.RegularExpressions.Regex Regex(string) Regex(string, RegexOptions)
The following example shows the Java and C# statements required to compile a regular expression that matches name/value pairs of the form author = Adam Freeman:
// Java Pattern p = Pattern.compile("\\b\\w+\\s*=\\s*.*"); // C# Regex r = new Regex(@"\b\w+\s*=\s*.*");
Note the following:
The C# example uses the @ symbol to indicate a verbatim string. This permits the inclusion of \ characters without the need to escape them as seen in the Java equivalent. The regular expression "\b\w+\s*=\s*.*" used in the preceding example can be broken down as follows: o \b matches a word boundary. o \w+ matches one or more word characters. o \s* matches zero or more white-space characters. o = matches the equal sign. o .* matches any character except the newline character \n.
More Information
For a complete description of the syntax supported by .NET regular expressions, refer to the .NET documentation.
Regular Expression Compilation Flags
When a regular expression is constructed, compilation flags can be provided to modify its behavior. In .NET, these flags are specified as a bit mask using members of the System.Text.RegularExpressions.RegexOptions enumeration. Table 7-13 summarizes the more useful flags alongside their Java equivalents.
Table 7-13. Regular Expression Compilation Flags in Java and .NET
Java COMMENTS N/A
.NET Description IgnorePatternWhitespace Ignores any white space and comments without the need to escape them. Compiles the regular expression to MSIL Compiled code. See the next section for more details.
7. Strings and Regular Expressions
ExplicitCapture
CASE_INSENSITIVE IgnoreCase UNICODE_CASE MULTILINE N/A DOTALL N/A Multiline RightToLeft Singleline ECMAScript
Only explicitly named or numbered groups are valid captures. The Java CASE_INSENSITIVE flag works only for ASCII characters. It must be used in conjunction with UNICODE_CASE to support case-insensitive Unicode. Specifies multiline mode. Specifies that searches should go from right to left. Specifies single-line mode. Enables ECMAScript-compliant behavior.
The RegexOptions.Compiled Flag
Given that all regular expressions must be compiled, the name of this flag is a little confusing. However, a regular expression is normally compiled to an intermediate form that is interpreted by the regular expressions engine at run time. The RegexOptions.Compiled flag forces compilation of the regular expression down to MSIL code. This results in faster execution but slower loading. Use the Compiled flag sparingly. The common language runtime (CLR) cannot unload generated MSIL code without unloading the entire application domain. Using the Compiled flag frequently will result in compiled regular expressions consuming system resources.
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