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By default, greediness is controlled by the Greedy property of the RegExOptions class, but can be overridden using the "?". The "?" is used as a "greediness" modifier for a subpattern in a regular expression. You can use them to specify an optional character, as in the examples in the following section. Please note that, since * and ? match zero instances of the pattern, they always succeed but may not select any text. + finds a string of one or more consecutive numbers, such as "90404", "1938", the "32" in "Win32", etc. * finds an entire line of text, up to but not including the return character. Repetition characters are modifiers that allow you to repeat a specified pattern.ĭ* finds no characters, or one or more consecutive "d"s.
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The following patterns are wildcards for the following special characters:Īny whitespace character (space, tab, return, linefeed, form feed)Īny "word" character (a-z, A-Z, 0-9, and _)Īny "non-word" character (All characters not included by \w). You can use the following notation to find non-printing characters: To match a -, place it at the beginning or end of the set. To find the caret character, place it anywhere except as the first character after the opening bracket.įinds a character in the range a-c or the - sign. To find a a closing bracket, place it immediately after the opening bracket.įinds a character in the range a-e or the caret character. Note: Case-sensitivity is controlled by the CaseSensitive property of the RegExOptions class.įinds a ]. Here are some examples:Īny character in the range a-e, inclusiveĪny alphanumeric character. If you want to ignore the character class instead of match it, precede it by a caret (^).
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The set of characters is enclosed in brackets. You can choose to either match or ignore the character class. $: Finds the last character in the current line.Ī character class allows you to specify a set or range of characters. ^Phone: Finds lines that begin with "Phone":Įnd of a line (unless used in a character class) The following wildcards match by position in a line:īeginning of a line (unless used in a character class see below) If you use the "." as the search pattern, you will select the first character in the target string and, if you repeat the search, you will find each successive character, except for Return characters Some special characters are used to match a class of characters:Īny single character except a line break, including a space. It extends normal Search and Replace with pattern searching. The basic idea of regular expressions is that it enables you to find and replace text that matches the set of conditions you specify. Both Search and Search and Replace operations work on all platforms, provided that this conversion takes place. The result of the Search or Search and Replace will be a UTF8 string, so you will need to convert it back to its original form using the Text Converter functions. This includes SearchPattern, ReplacementPattern, and TargetString.
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See, for example, the TextConverter class for an example of how to use the Text Converter functions.Īll text that will be processed by RegEx should be converted. You should first convert all double-byte text to UTF8 using the built-in Text Converter functions. If you are working with a double-byte system such as Japanese, RegEx cannot operate on the characters directly. Replaced with the character that is the control version of X, e.g., \cP is DLE, data line escape. Replaced with the character represented by nn in Octal. Replaced with the character represented by nn in Hex, e.g., ™is ™. $0-$50 evaluate to nothing if the subexpression corresponding to the number doesn't exist. Replaced with the entire target string following the matched text. The entire matched area this is identical to \0 and $0. Replaced with the entire target string before match. The following expressions can only apply to the replacement pattern: Matches a word boundary (outside only).Īnchors match to the beginning of a line or string.Īnchors match to the end of a line or string. Matches at least m x's, but no more than n. Matches 0 or 1 x's, where x is any of above. Matches whatever first (second, and so on) of parens matched. Referenced by replacement patterns that use \1, \2, etc. Remembers the match for later backreferences. Matches an ASCII character of that hexadecimal value. Matches an ASCII character of that octal value. Use to match a backspace.Īlso matches a null character because of the following: Matches a whitespace character (space, tab, newline, etc.). Matches an alphanumeric (word) character. This section describes the syntax of regular expressions. The RegEx class uses the current version of the PCRE library, 8.33. Used to do search and replace operations using regular expressions (i.e., perl).