Get index of first detected space after a certain index in a string

Question

In a string to format (mostly to replace chars with different symbols for rendering test on UI), I have to detect % and then skip all chars util first space from this % char

Answer 1

Following is easiest, and extensible, for your requirement "abcd%1$s efgh %2$d ijkl in this string I have to skip this %1$s & %2$d which are some sort of formatting placeholders."

string[] placeHolders = new string[] {"%1$s", "%2$d"};
string[] splits = "abcd%1$s efgh %2$d ijkl".Split(placeHolders, StringSplitOptions.None);

which will provide splits as ["abcd", "efgh", "ijkl"]

Answer 2

You can get that pretty easily, just grab the index if the first percent sign and then leverage that index to find the first space from there:

var start = myString.IndexOf("%");
var spaceIndex = myString.IndexOf(" ", start)

of course the value of myString is the string you represented in your question.