Searching, Modifying, and Encoding Text in VB.NET

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Searching, Modifying, and Encoding Text
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multiple captures, a backreference (such as \1 in the following example) refers to the group captures, numbered from left to right. For example, ( <first>a)( <second>\1b)* matches aababb, with the capturing pattern (a)(ab)(abb). The \1 metacharacter refers to the first group, \2 refers to the second group, and so on. Table 3-5 lists optional parameters that add backreference modifiers to a regular expression.
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Table 3-5
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Backreference Parameters
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Backreference Construct \number \k<name>
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Definition Backreference. For example, (\w)\1 finds doubled characters. Named backreference. For example, ( <char>\w)\k<char> finds doubled words. The expression ( <43>\w)\43 does the same. You can use single quotes instead of angle brackets for example, \k'char'.
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How to Specify Regular Expression Options
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You can modify a regular expression pattern with options that affect matching behavior. Regular expression options can be set in one of two basic ways: they can be specified in the options parameter in the Regex(pattern, options) constructor, where options is a bitwise OR combination of RegexOptions enumerated values, or they can be set within the regular expression pattern using the inline ( imnsx-imnsx:) grouping construct or ( imnsx-imnsx) miscellaneous construct. In inline option constructs, a minus sign ( ) before an option or set of options turns off those options. For example, the inline construct ( ix ms) turns on the IgnoreCase and IgnorePatternWhitespace options and turns off the Multiline and Singleline options. All regular expression options are turned off by default. Table 3-6 lists the members of the RegexOptions enumeration and the equivalent inline option characters.
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The options RightToLeft and Compiled apply only to an expression as a whole and are not allowed inline. (They can be specified only in the options parameter to the Regex constructor.) The options None and ECMAScript are not allowed inline.
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NOTE
Lesson 1: Forming Regular Expressions
Table 3-6
Regular Expression Options
RegexOption Member None IgnoreCase Multiline
Inline Character N/A i m
Description Specifies that all options are turned off. Specifies case-insensitive matching. Specifies multiline mode. Changes the meaning of ^ and $ so that they perform matching at the beginning and end, respectively, of any line, not just at the beginning and end of the whole string. Specifies that the only valid captures are explicitly named or numbered groups of the form ( <name> ). This allows parentheses to act as noncapturing groups. Specifies that the regular expression will be compiled to an assembly. Generates Microsoft Intermediate Language (MSIL) code for the regular expression; yields faster execution at the expense of start-up time. Specifies single-line mode. Changes the meaning of the period character (.) so that it matches every character (instead of every character except \n). Specifies that unescaped white space is excluded from the pattern, and enables comments following a number sign (#). Specifies that the search moves from right to left instead of from left to right. A regular expression with this option moves to the left of the starting position instead of to the right. (Therefore, the starting position should be specified as the end of the string instead of the beginning.) This option cannot be specified in midstream, which is a limitation designed to prevent the possibility of crafting regular expressions with infinite loops. RightToLeft changes only the search direction. It does not reverse the substring that is searched for.
ExplicitCapture
Compiled
Singleline
IgnorePatternWhitespace RightToLeft
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Searching, Modifying, and Encoding Text
Table 3-6
Regular Expression Options
RegexOption Member ECMAScript
Inline Character N/A
Description Specifies that ECMAScript-compliant behavior is enabled for the expression. This option can be used only in conjunction with the IgnoreCase and Multiline flags. Use of ECMAScript with any other flags results in an exception. Specifies that cultural differences in language are ignored.
CultureInvariant
Consider the following three-line text file:
abc def ghi
If this text file is read into a string named s, the following method call returns false because def is not at both the beginning and end of the string:
Regex.IsMatch(s,"^def$")
But the following method call returns true because the RegexOptions.Multiline option enables the ^ symbol to match the beginning of a line (rather than the entire string), and also enables the $ symbol to match the end of a line:
Regex.IsMatch(s,"^def$",RegexOptions.Multiline)
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