VBScript Reference Manual for InduSoft Web Studio

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VBScript Reference Manual InduSoft Web Studio Matches Description Collection of regular expression Match objects. Usage Set Matches = objRegexp.Execute(string) Arguments objRegexp A RegExp object that was previously instantiated string A command string to execute for the RegExp object Remarks A Matches collection contains individual Match objects, and can be only created using the Execute method of the RegExp object. The Matches collection's one property is read-only, as are the individual Match object properties. When a regular expression is executed, zero or more Match objects can result. Each Match object provides access to the string found by the regular expression, the length of the string, and an index to where the match was found. See Also RegExp, Match Example Dim regEx, Match, Matches, RetStr, srExp 'Create variable. strExp = “Is1 is2 IS3 is4” ‘Input string Set regEx = New RegExp 'Instantiate RegExp object regEx.Pattern = “is.” 'Set pattern. regEx.IgnoreCase = True 'Set case insensitivity. regEx.Global = True 'Set global applicability. Set Matches = regEx.Execute(strExp) 'Execute search. RetStr = “” ‘Zero out string For Each Match in Matches 'Iterate Matches collection. RetStr = RetStr & "Match found at position " RetStr = RetStr & Match.FirstIndex & ". Match Value is '" RetStr = RetStr & Match.Value & "'." & vbCRLF Next MsgBox RetStr 204 InduSoft, Ltd.
InduSoft Web Studio VBScript Reference Manual RegExp Description Provides simple regular expression support. Usage Varies with properties and methods used Arguments Varies with properties and methods used Remarks Property Global Function: Sets or returns a Boolean value that indicates if a pattern should match all occurrences in an entire search string or just the first one. Usage: RegExp.Global [= True | False ] Arguments The value of the Global property is True if the search applies to the entire string, False if it does not. Default is False. Remarks See example below Property Pattern Function: Sets or returns the regular expression pattern being searched for. Usage: RegExp.Pattern [= "searchstring"] Arguments searchstring Optional. Regular string expression being searched for. May include any of the regular expression characters defined in the table in the Settings section. Settings Special characters and sequences are used in writing patterns for regular expressions. The following tables describe the characters that can be used. Position Matching Position matching involves the use of the ^ and $ to search for beginning or ending of strings. Setting the pattern property to "^VBScript" will only successfully match "VBScript is cool." But it will fail to match "I like VBScript." Literals Literals can be taken to mean alphanumeric characters, ACSII, octal characters, hexadecimal characters, UNICODE, or special escaped characters. Since some characters have special meanings, we must escape them. To match these special characters, we precede them with a "\" in a regular expression. Character Classes Character classes enable customized grouping by putting expressions within [] braces. A negated character class may be created by placing ^ as the first character inside the []. Also, a dash can be used to relate a scope of characters. For example, the regular expression "[^a-zA-Z0-9]" matches everything except alphanumeric characters. In addition, some common character sets are bundled as an escape plus a letter. Repetition Repetition allows multiple searches on the clause within the regular expression. By using repetition matching, we can specify the number of times an element may be repeated in a regular expression. Alternation & Grouping Alternation and grouping is used to develop more complex regular expressions. Using alternation and grouping techniques can create intricate clauses within a regular expression, and offer more flexibility and control. Back References Back references enable the programmer to refer back to a portion of the regular expression. This is done by use of parenthesis and the backslash (\) character followed by a single digit. The first parenthesis clause is referred by \1, the second by \2, etc. InduSoft, Ltd. 205
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