how to replace some character b/w strings in c#?

how to replace some character b/w strings in c#?

suppose

string is : 1-开发者_JAVA技巧2-5-7-8-9-10-15

i use replace function

when i replace 5 with 2

it also replace the last 15 to 12 because of 5 there.

so how can i get the right output?

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You can use this:

yourString.Split("-").Select(s => Regex.Replace(s, "^5$", "2")).Aggregate((a,b) => a + "-" + b);

In contrast to most of the other answers here, this also handles the case, when the string to be replaced is at the beginning or the end of the input string.

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new Regex(@"\b5\b").Replace("1-2-5-7-8-9-10-15", "2");

The \b matches a word boundary. This means that '-5-' will be matched but '-15-' won't.

It will will also handle the case where the match is at the edge of the string and does not have a hyphen on both sides, e.g. '5-' and '-5'.

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You will need to replace -5- with -2-

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Try this

yourString = yourString.Replace("-5-","-2-");

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you could use a regex replace and replace with a regex something like

[^\d]*5[^\d]* to match a 5 without any numbers next to it

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Do you have a separator?

E.g. If you really have the string link 1-2-5... you can replace '-5' with -2.