Earlier versions treated it as a needlessly escaped literal v. Perl 5.10, PCRE 7.2, PHP 5.2.4, R, Delphi XE, and later versions treat it as a shorthand. That includes the vertical tab, form feed, and all line break characters. ![]() In other flavors, \v is a shorthand that matches any vertical whitespace character. In some flavors, \v matches the vertical tab (ASCII 0x0B). Remember that Windows text files use \r\n to terminate lines, while UNIX text files use \n. More exotic non-printables are \a (bell, 0x07), \e (escape, 0x1B), and \f (form feed, 0x0C). ![]() ![]() Use \t to match a tab character (ASCII 0x09), \r for carriage return (0x0D) and \n for line feed (0x0A). You can use special character sequences to put non-printable characters in your regular expression.
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