Hi,
I have several regular expressions that I need to run against
documents. Is it possible to combine several expressions in one
expression in Regex object. So that it is faster, or will I have to
use all the expressions seperately?
Here are my regular expressions that check for valid email address and
link
Dim Expression As String =
"([\w\-]+\.)*[\w\-]+@([\w\-]+\.)+([\w\-]{2,5})"
EmailRegex = New Regex(Expression, RegexOptions.IgnoreCase Or
RegexOptions.Compiled)
Dim HrefPattern As String =
"href\s*=\s*(?:""(?<match>[^""]*)""|(?<match>\S+))"
HrefRegex = New Regex(HrefPattern, RegexOptions.IgnoreCase Or
RegexOptions.Compiled)
so can I combine both regular expressions in one?
Thanks 2 4993
Sehboo,
Using Alternation you can combine regular expressions.
Dim regex As New Regex(Expression & "|" & HrefPattern,
RegexOptions.IgnoreCase Or RegexOptions.Compiled)
You may want to also use a grouping construct with a name so you know which
expression you matched...
Also you may want to use Match & NextMatch to walk the matches found,
however I do not have a good example of this...
I find both of the following sites invaluable when working with regular
expressions.
A tutorial & reference on using regular expressions: http://www.regular-expressions.info/
The MSDN's documentation on regular expressions: http://msdn.microsoft.com/library/de...geElements.asp
Hope this helps
Jay
"Sehboo" <ma*********@hotmail.com> wrote in message
news:7b**************************@posting.google.c om... Hi,
I have several regular expressions that I need to run against documents. Is it possible to combine several expressions in one expression in Regex object. So that it is faster, or will I have to use all the expressions seperately?
Here are my regular expressions that check for valid email address and link Dim Expression As String = "([\w\-]+\.)*[\w\-]+@([\w\-]+\.)+([\w\-]{2,5})" EmailRegex = New Regex(Expression, RegexOptions.IgnoreCase Or RegexOptions.Compiled)
Dim HrefPattern As String = "href\s*=\s*(?:""(?<match>[^""]*)""|(?<match>\S+))" HrefRegex = New Regex(HrefPattern, RegexOptions.IgnoreCase Or RegexOptions.Compiled)
so can I combine both regular expressions in one?
Thanks
Sehboo,
Using Alternation you can combine regular expressions.
Dim regex As New Regex(Expression & "|" & HrefPattern,
RegexOptions.IgnoreCase Or RegexOptions.Compiled)
You may want to also use a grouping construct with a name so you know which
expression you matched...
Also you may want to use Match & NextMatch to walk the matches found,
however I do not have a good example of this...
I find both of the following sites invaluable when working with regular
expressions.
A tutorial & reference on using regular expressions: http://www.regular-expressions.info/
The MSDN's documentation on regular expressions: http://msdn.microsoft.com/library/de...geElements.asp
Hope this helps
Jay
"Sehboo" <ma*********@hotmail.com> wrote in message
news:7b**************************@posting.google.c om... Hi,
I have several regular expressions that I need to run against documents. Is it possible to combine several expressions in one expression in Regex object. So that it is faster, or will I have to use all the expressions seperately?
Here are my regular expressions that check for valid email address and link Dim Expression As String = "([\w\-]+\.)*[\w\-]+@([\w\-]+\.)+([\w\-]{2,5})" EmailRegex = New Regex(Expression, RegexOptions.IgnoreCase Or RegexOptions.Compiled)
Dim HrefPattern As String = "href\s*=\s*(?:""(?<match>[^""]*)""|(?<match>\S+))" HrefRegex = New Regex(HrefPattern, RegexOptions.IgnoreCase Or RegexOptions.Compiled)
so can I combine both regular expressions in one?
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