VB Script Regular Expressions Utility Functions

VB Script Regular Expressions Utility Functions

Function to check if a string matches a Regular Expression Pattern

Function IsRegExMatch(strText, regEx_Pattern, blnMatchCompleteString)

Dim oRegExp, retVal

'‘Create regular expression object.

Set oRegExp = New RegExp

'‘Set pattern.

oRegExp.Pattern = regEx_Pattern

'‘Ignore case

oRegExp.IgnoreCase = True

'‘Match complete string or not

oRegExp.Global = blnMatchCompleteString

'‘Test the regular expression

IsRegExMatch = oRegExp.Test(strText)

Set oRegExp = Nothing

End Function

msgbox IsRegExMatch("welcome to vb script", "welcome", blnMatchCompleteString)

Function to Match a Regular Expression and Replace with a particular text if a string matches a regular expression pattern.

Function RegExMatchandReplace(strText,regEx_Pattern,strReplacementText,blnMatchCompleteString)

Dim oRegExp, retVal,strReplacedText

'‘Create regular expression object.
Set oRegExp = New RegExp

'‘Set pattern.
oRegExp.Pattern = regEx_Pattern
'‘Ignore case
oRegExp.IgnoreCase = True
'‘Match complete string or not
oRegExp.Global = blnMatchCompleteString

'‘Test the regular expression

RegExMatch = oRegExp.Test(strText)

If RegExMatch = True Then

strReplacedText = oRegExp.Replace(strText,strReplacementText)

End If

RegExMatchandReplace = strReplacedText

Set oRegExp = Nothing

End Function

msgbox RegExMatchandReplace("welcome to vb script", "welcome", "ending",blnMatchCompleteString)

Function to Get Total Number of Matches of a Regular Expression Pattern in a particular string

Function GetRegExMatchCount(strText, regEx_Pattern, blnMatchCompleteString)
Dim oRegExp, retVal
‘Create regular expression object.
Set oRegExp = New RegExp

‘Set pattern.
oRegExp.Pattern = regEx_Pattern
‘Ignore case
oRegExp.IgnoreCase = True
‘Match complete string or not
oRegExp.Global = blnMatchCompleteString

‘Test the regular expression
RegExpMatch = oRegExp.Test(strText)
If RegExpMatch Then
Set oRegExMatchCount = oRegExp.Execute(strText)
GetRegExMatchCount = oRegExMatchCount.Count
End If
Set oRegExp = Nothing
End Function

Function to Trim white space characters from end of a string

Public Function RTrimW(ByVal Text)
‘String pattern ending with carriage return, tab, new line or a space character
RTrimPattern = “[\s]*$”

Dim oRegExp
Set oRegExp = New RegExp
oRegExp.Pattern =RTrimPattern
oRegExp.Global = False
RTrimW = oRegExp.Replace(Text,”")
Set oRegExp = Nothing
End Function

Function to Trim white space characters from start of a string

Public Function LTrimW(ByVal Text)
‘String pattern ending with carriage return, tab, new line or a space character
LTrimPattern = “^[\s]*”
Dim oRegExp
Set oRegExp = New RegExp
oRegExp.Pattern = LTrimPattern
oRegExp.Global = False
LTrimW = oRegExp.Replace(Text,”")
Set oRegExp = Nothing
End Function

Function to Trim white space characters from both start and end of a string

Public Function TrimW(ByVal Text)
TrimW = LTrimW(RTrimW(Text))
End Function