3.4. Set Regular Expression Options
Problem
You want to compile a regular expression with all of the available matching modes: free-spacing, case insensitive, dot matches line breaks, and “^ and $ match at line breaks.”
Solution
C#
Regex regexObj = new Regex("regex pattern
",
RegexOptions.IgnorePatternWhitespace | RegexOptions.IgnoreCase |
RegexOptions.Singleline | RegexOptions.Multiline);
VB.NET
Dim RegexObj As New Regex("regex pattern
",
RegexOptions.IgnorePatternWhitespace Or RegexOptions.IgnoreCase Or
RegexOptions.Singleline Or RegexOptions.Multiline)
Java
Pattern regex = Pattern.compile("regex pattern
",
Pattern.COMMENTS | Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE |
Pattern.DOTALL | Pattern.MULTILINE);
JavaScript
Literal regular expression in your code:
var myregexp = /regex pattern
/im;
Regular expression retrieved from user input, as a string:
var myregexp = new RegExp(userinput, "im");
XRegExp
var myregexp = XRegExp("regex pattern
", "xism");
PHP
regexstring = '/regex pattern
/xism';
Perl
m/regex pattern
/xism;
Python
reobj = re.compile("regex pattern
",
re.VERBOSE | re.IGNORECASE |
re.DOTALL | re.MULTILINE)
Ruby
Literal regular expression in your code:
myregexp = /regex pattern
/xim;
Regular expression retrieved from user input, as a string:
myregexp = Regexp.new(userinput, Regexp::EXTENDED or Regexp::IGNORECASE or Regexp::MULTILINE);
Discussion
Many of the regular expressions in this book, and those that you find elsewhere, are written to be used with certain regex matching modes. There are four basic ...
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