Set DotMatchAll (False by default) to True to make the dot match all characters, including line break characters.

This option is the inverse of “case insensitive mode” or /i in other programming languages.

Set CaseSensitive (False by default) to True to treat uppercase and lowercase letters as different characters.

The RegExOptions class has nine properties to set various options for your regular expression. SubExpressionStartB returns the byte offset of the start of the match of the whole regex or one of the capturing groups depending on the numeric index you pass as a parameter to the property. SubExpressionString(0) returns the whole regex match, while SubExpressionString(1) through SubExpressionString(SubExpressionCount-1) return the matches of the capturing group. The SubExpressionString property returns the substring matched by the regular expression or a capturing group. The SubExpressionCount property returns the number of capturing groups in the regular expression plus one. When the Regex.Search method finds a match, it stores the match’s details in a RegExMatch object. Keep calling Search without any parameters until it returns Nil to iterate over all regular expression matches in the string. Do not pass the subject string again, since doing so restarts the search from the beginning of the string. To find the second match in the same subject string, call the Search method again, without any parameters. This method returns an instance of the RegExMatch class if a match is found, or Nil if no match is found. To check if a regular expression matches a particular string, call the Search method of the RegEx object, and pass the subject string as a parameter. You can set various options in the Options property, which is an instance of the RegExOptions class. Assign your regular expression to the SearchPattern property. To use a regular expression, you need to create a new instance of the RegEx class. You’ll also need to use the TextConverter to convert the strings returned by the RegEx class from UTF-8 back into the encoding your application is working with.

This means that if you want to process non-ASCII data that you’ve retrieved from a file or the network, you’ll need to use Xojo’s TextConverter class to convert your strings into UTF-8 before passing them to the RegEx object. In PCRE, they’re off by default, while in Xojo they’re on by default. The only exception are the case insensitive and “multi-line” matching modes. Everything said in the tutorial about PCRE’s regex flavor also applies to Xojo.

The regular expressions tutorial on this website does not explicitly mention Xojo. What this means to you as a Xojo developer is that the RegEx class provides you with a rich flavor of Perl-compatible regular expressions. Internally, this class is based on the open source PCRE library. Xojo, formerly known as REALbasic, includes a built-in RegEx class. How to Use Regular Expressions in Xojo (REALbasic)

Xojo break