Hi All,

I have the following string:

"ST ST ST ST ST ST ST ST ST"

I put this in a StringBuilder. Then I call Replace(" ST ", "SAINT"). Please not the 1 preceding and 1 trailing space in the string " ST "

My output is:

ST SAINT ST SAINT ST SAINT ST SAINT ST

When I would expect:

ST SAINT SAINT SAINT SAINT SAINT SAINT SAINT ST.

Why is every occurrence of " ST " not being replaced A 'workaround' would be to call the replace method twice... BUT I think that StringBuilder is not performaing as it should.

I am Using .NET 1.1. Thanks everyone.

Chris

Thanks all,

Apologies but I went edit thread at aork at when I got home it wasn't edited, and to emphasise a small point that could easily be missed (that of the leading and trailing spaces), I decided to repost:

Try placing the spaces with 'b' to see why you're getting what you're getting:

"STbSTbSTbSTbSTbSTbSTbSTbST", Replace("bSTb", "SAINT")...

The Replace method finds the first one:

"STbSTbSTbSTbSTbSTbSTbSTbST": resulting in:

"STSAINTSTbSTbSTbSTbSTbSTbST". The next find is:

"STSAINTSTbSTbSTbSTbSTbSTbST", etc...

Hi Peter,

You forgot to replace the spaces in the saint string with b's too (i.e. "bSAINTb").

So to use the good way you explained things my scenario would look like:

"STbSTbSTbSTbSTbSTbSTbSTbST": resulting in:

"STbSAINTbSTbSTbSTbSTbSTbSTbST". The next find is:

"STbSAINTbSTbSTbSTbSTbSTbSTbST", etc...

It should get them all, but does not. The reason must be because it parses all instances of the substring first, and then replaces each instance it has found (without considering the implications of the replace). An algorithmic flaw or not The more I think of it probably not; as if we considered every replace possibility after a replace we could end up with an endless loop, growing string, and troubles!

Thanks all

Chris

Hi CJW99, your first post didn't include spaces around SAINT. But, if it did (switching from "SAINT" to "bSAINTb", what would occur would be this:

First found:
STbSTbSTbSTbSTbSTbSTbSTb

First replace:
STbSAINTbSTbSTbSTbSTbSTbSTb

Now at this point the next search will only be searching the green portion (it doesn't start again from the beginning):
STbSAINTbSTbSTbSTbSTbSTbSTb

In which case the next find will be:
STbSAINTbSTbSTbSTbSTbSTbSTb

Continuing on with the above results in:
STbSAINTbSTbSAINTbSTbSAINTbSTbSAINTb

...which, if I remember correctly, the result you observed.

Aaaah yes there was confusion then my posts got merged etc.

Thanks for your help everyone, it was the result. All solved now :)