$str = ""; if ($str ne "") { print "String is not empty\n"; } else { print "String is empty\n"; } Output: String is empty #Checking for Empty Strings using Numeric Comparison Operators Perl provides numeric comparison operators to check if a string is empty or not. == The...
Afterdeclaring a string variable, use the-zoperator in anif statementto check whether a string is empty or not: MY_STRING="" if [ -z $MYSTRING ] then echo "String is empty" else echo "String is not empty" fi For more Shell scripting tips,check out or Bash/Shell scripting articles!
# Program to check if a string is palindrome or not my_str = 'aIbohPhoBiA' # make it suitable for caseless comparison my_str = my_str.casefold() # reverse the string rev_str = reversed(my_str) # check if the string is equal to its reverse if list(my_str) == list(rev_str):...
It returns a boolean value indicating whether the string is empty or not. This method checks if the length of the string is zero. String str1 = ""; String str2 = "Hello, World!"; // Using the isEmpty() method boolean isEmpty1 = str1.isEmpty(); // true boolean isEmpty2 = ...
Check if a string is null or empty in XSLT 多条件查询 string.Format("/root/deviceList//item/guid[{0}]", strBuilder.ToString()) "/root/deviceList//item/guid[text()=\"h\" or text()=\"a\" or text()=\"c\"]"谓词嵌套var nodes = xmlDoc.SelectNodes(string.Format("/root/device...
String str2 = ""; String str3 = "Hello, World!"; // Check if str1 is null or empty if (str1 == null || str1.length() == 0) { System.out.println("str1 is null or empty."); } else { System.out.println("str1 is not null or empty."); } // Check if str2 is nul...
Checks whether the parameter is not null or empty. Namespace: Microsoft.WindowsServerSolutions.WebApi.Framework Assembly: Wssg.WebApi.Framework (in Wssg.WebApi.Framework.dll) Syntax C# Copy public static void CheckIsNotNullOrEmpty( string paramName, string paramValue ) Parameters paramName Type...
object EmptyStringExtensions { extension (str: String) def isEmptyOrWhitespace: Boolean = str.trim.isEmpty def isNullOrEmptyOrWhitespace: Boolean = str == null || str.isEmptyOrWhitespace } We must import EmptyStringExtensions to use the methods we defined above: import EmptyStringExtensions._ cl...
Checking if a string is NULL or EMPTY is very common requirement in Powershell script. If we don’t do that we will end up with run time errors if we try to perform some operation on that string variable which is empty or null. So the question now is, how to check it?
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