Get the substring of the non conditional part
Get the substring of the non conditional part
I have this string for example:2X+4+(2+2X+4X) +4
The position of the parenthesis can vary. I want to find out how can I extract the part without the parenthesis. For example I want 2X+4+4. Any Suggestions?
I am using C#.
2X+4+(2+2X+4X) +4
2X+4+4
@Aldert This is a C# question how can you make it a duplicate of a javascript question? Please remove your flags
– Zeeshan Adil
Sep 14 '18 at 5:19
@Shahrier, this is because I am looking for a good solution for you and this would be regex, especially when you have parenthisis in perenthises. I did not even look at the language.
– Aldert
Sep 14 '18 at 5:22
If you just remove the parentheses you get
2X+4++4. Am I correct that you want only 1 plus between the two 4's? What if it's not plusses but other operators?– Hans Kilian
Sep 14 '18 at 5:25
2X+4++4
What would happen if you had
2X+4+(2+2X+(3X+7X)+4X)+4? Is that possible to get?– Enigmativity
Sep 14 '18 at 5:56
2X+4+(2+2X+(3X+7X)+4X)+4
3 Answers
3
Try this one:
var str = "(7X+2)+2X+4+(2+2X+(3X+3)+4X)+4+(3X+3)";
var result =
str
.Aggregate(
new Result = "", depth = 0 ,
(a, x) =>
new
Result = a.depth == 0 && x != '(' ? a.Result + x : a.Result,
depth = a.depth + (x == '(' ? 1 : (x == ')' ? -1 : 0))
)
.Result
.Trim('+')
.Replace("++", "+");
//result == "2X+4+4"
This handles nested, preceding, and trailing parenthesis.
Try Regex approach:
var str = "(1x+2)-2X+4+(2+2X+4X)+4+(3X+3)";
var regex = new Regex(@"(S+?)W?");//matches '(1x+2)-', '(2+2X+4X)+', '(3X+3)'
var result = regex.Replace(str, "");//replaces parts above by blank strings: '2X+4+4+'
result = new Regex(@"W$").Replace(result, "");//replaces last operation '2X+4+4+', if needed
//2X+4+4 ^
Can you please share why this Regex work? or maybe share some link to understand the Regex patterns? Thanks
– Zeeshan Adil
Sep 14 '18 at 5:29
This would fail on
"2X+4+(2+2X+4X)+4+(3X+3)".– Enigmativity
Sep 14 '18 at 5:58
"2X+4+(2+2X+4X)+4+(3X+3)"
I agree, this approach using Regex is much more neat
– Mrinal Kamboj
Sep 14 '18 at 5:58
@Enigmativity, your case is fixed
– Slava Utesinov
Sep 14 '18 at 6:11
Try simple string Index and Substring operations as follows:
string s = "2X+4+(2+2X+4X)+4";
int beginIndex = s.IndexOf("(");
int endIndex = s.IndexOf(")");
string firstPart = s.Substring(0,beginIndex-1);
string secondPart = s.Substring(endIndex+1,s.Length-endIndex-1);
var result = firstPart + secondPart;
(
)
beginIndex
endIndex
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Possible duplicate: stackoverflow.com/questions/17779744/…
– Aldert
Sep 14 '18 at 5:15