CODEWITHSUNDEEP
c#string
SAHIL SINGLA
SAHIL SINGLA

Reputation: 755

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

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

suppose

string is : 1-2-5-7-8-9-10-15

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?

Upvotes: 3

Views: 319

Answers (6)

Paul Ruane
Paul Ruane

Reputation: 38590

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'.

Upvotes: 4

Daniel Hilgarth
Daniel Hilgarth

Reputation: 174299

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.

Upvotes: 7

Yablargo
Yablargo

Reputation: 3596

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

Upvotes: 2

Pleun
Pleun

Reputation: 8920

Do you have a separator?

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

Upvotes: 0

Stecya
Stecya

Reputation: 23266

Try this

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

Upvotes: 2

cadrell0
cadrell0

Reputation: 17307

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

Upvotes: 3

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