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I'm running into an issue where I get ArgumentOutOfRangeException which is caused by my string being 5 characters and my substring starting at character 6. The problem is I want my code to ignore it if the substring is out of range of the string.

if(tok[i] == "PRINT"){
    if(tok[i+1].Substring(0,3) == "NUM"){

    }else if(tok[i+1].Substring(0,4) == "EXPR"){

    }else if(tok[i+1].Substring(0,6) == "STRING"){

So my solution was to order the if statements as you see above starting from the smallest substring check to the largest substring check; however, I think there is a better way to do this that I'm missing. Any feedback is appreciated.


print "test"
print "asd"
print "last"
print 1
print 123894

so If I am testing for STRING first then the error will occur when it reaches "print 1" as the STRINGs Substring starts at character 8 which is greater than "print 1" which is 7 characters

Here is one refactoring:

var token = tok[i + 1];
var length = token.Length;
var start = token.SubString(0, 3);
var value = "";
if (start == "NUM")
    value = token.SubString(4, length - 1);
else if (start == "EXP")
    Debug.Assert(token.SubString(4, 1) == "R");
    value = token.SubString(5, length - 1);
else if (start == "STR")
    Debug.Assert(token.SubString(4, 3) == "ING");
    value = token.SubString(8, length - 1);

Check if the string satisfies the given condition, Given a string str, the task is to check whether the count of vowels in the given string is prime or not. In the end, if count is prime then print YES else print NO. Function that returns true if n is prime string palindrome · Print the frequency of each character in Alphabetical order · Lexicographically all Shortest Palindromic  When ordering by an expression, you can specify substrings only for expressions that return a character data type. If you specify a column substring in the ORDER BY clause, the column must have one of the following data types: BYTE, CHAR, NCHAR, NVARCHAR, TEXT, or VARCHAR.

This is what I suggest.

string[] tokens = { "NUMBER", "EXPRESSION", "STRING", "INTEGER" };

for (int i = 0; i < tokens.Length; i++)
    string input = tokens[i];

    if (input.Substring(0, Math.Min(input.Length, 3)) == "NUM")
    else if (input.Substring(0, Math.Min(input.Length, 4)) == "EXPR")
    else if (input.Substring(0, Math.Min(input.Length, 6)) == "STRING")

[PDF] 059-30: A Clever Demonstration of the SAS® SUBSTR Function, The SAS® SUBSTR function differs from the substring function in other programming languages as it can be allow comparison of values based on the prefix of a text string. MODIFIER is that SUBSTR can also be used in MACRO statements. if upcase(substr(prez, 1, 1)) = 'Y' then text_msg = 'Was President of the USA';. In a format specifier, if the flag is set to 'l', then the output of the result is left justified. To use the contents of the java.lang package in a program, they must be imported using the import statement. The dot (.) operator is also called the member specific operator.

Can do something like this:

string input = "print NUM";

string[] tokens = new[] { "NUM", "EXPR", "STRING" };
var myList = new List<string>(tokens);

var searchTerm =string.IsNullOrEmpty(input) ? "" : input.Substring("print".Length, input.Length - "print".Length).Trim();

var pos = myList.IndexOf(searchTerm);

switch (pos)
// its NUM
case 0:
// its EXPR
case 1: 
// its STRING
case 2:

// not found or default
case -1:

You can also use a HashSet. It depends upon your code's performance/situation

7. Strings, Depending on what we are doing, we may want to treat a compound data type as a If you want the zero-eth letter of a string, you just put 0, or any expression with the a member of an ordered set, in this case the set of characters in the string. This is the first example we have seen of a return statement inside a loop. If  Start studying CS 2336 Ch. 9. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

Loops and strings | Think Java, If the condition is true , execute the statements and go back to step 1. This type of flow is String indexes range from 0 to n−1, where n is the length of the string. So the When the loop exits, r contains the letters from s in reverse order. So the​  SELECT x = SUBSTRING ('abcdef', 2, 3); Here is the result set. x ---------- bcd (1 row (s) affected) B. Using SUBSTRING with text, ntext, and image data. To run the following examples, you must install the pubs database. The following example shows how to return the first 10 characters from each of a text and image data column in the pub_info

Oracle SUBSTR: Extract a Substring from a String, This tutorial shows you how to use Oracle SUBSTR() function to extract a If the start_position is 0, the begin of the substring will be at the first character of the str . The following statement returns the same substring as above but uses a and COUNT() functions get employee names and their counts based on the initials. You call the Substring(Int32) method to extract a substring from a string that begins at a specified character position and ends at the end of the string. The starting character position is a zero-based; in other words, the first character in the string is at index 0, not index 1.

MySQL SUBSTRING Function: Extract Substrings Like A Ninja, If the position is positive, the SUBSTRING function extracts the substring from the the position of the substring must be 7 as the following SELECT statement:. Although there is no such thing as Substring function in Excel, there exist three Text functions (LEFT, RIGHT, and MID) to extract a substring of a given length. Also, there are FIND and SEARCH functions to get a substring before or after a specific character.

  • I think you should use input.Substring(0, Math.Min(input.Length, NO_OF_CHAR)) in your if condition it will take length based on string length.
  • Take the length of the string before your if statements and store it in an integer variable. Add a test for that length being greater than the length of your substring.
  • Please provide the inputs required to cause the error and some samples of correct inputs.