How does Regex work?

[Guest]

I tried

Dim s As String = "1 2 3 4 5"

Regex.Replace(s, "3", "6")



but no luck, nothing was changed?

 

[Herfried K. Wagner [MVP]]

I tried

Dim s As String = "1 2 3 4 5"

Regex.Replace(s, "3", "6")

\\\
s = Regex.Replace(s, "3", "6")
///

 

[Guest]

This was driving me crazy, thanks!!!

\\\
s = Regex.Replace(s, "3", "6")
///

 

[Cor Ligthert [MVP]]

Lucio,

Why not just

Dim s As String = "1 2 3 4 5"

Regex.Replace(s, "3", "6")

s = Replace("3","6") it will not be a big time benefit, however there will
be probably a time benefit and describes in my idea at least better what you
want that the program does.

Just my idea

Cor

 

[Guest]

Hi Cor, the reason is that I was not really interested in the substitution
per se, I wanted to know how regex works, I am sure you are not
suggesting regex is an unusfull tool...

tnx.

 

[Tim Ferguson]

Hi Cor, the reason is that I was not really interested in the
substitution per se, I wanted to know how regex works, I am sure you
are not suggesting regex is an unusfull tool...

Ancient PERL proverb...

If you have a problem and require a regex to solve it, you now have two
problems.


All the best

Tim F

 

[Cor Ligthert [MVP]]

Lucio,

Hi Cor, the reason is that I was not really interested in the substitution
per se, I wanted to know how regex works, I am sure you are not
suggesting regex is an unusfull tool...

No in general not, however for the sample from you it is.

It is useful there where the change is complex.

Cor

 

[Guest]

It seems regular expressions where easier in vi and perl, though
they didn't have unicode to contend with...
regex- i love it !!

 

[Cor Ligthert [MVP]]

Lucio,

I forgot to give you some good links for regex.

RegexLib
http://www.regexlib.com/Default.aspx

Expresso
http://www.ultrapico.com/Expresso.htm
I hope this helps a little bit?

Cor

 

[Guest]

Thank you Cor, you have read my mind.