$str = ""; if ($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...
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...
Afterdeclaring a string variable, use the-zoperator in anif statementto check whether a string is empty or not: MY_STRING="" if [ -z $MYSTRING ] then echo "String is empty" else echo "String is not empty" fi For more Shell scripting tips,check out or Bash/Shell scripting articles!
Well, below is the most often used technique to check if a string is NULL or empty if($mystring) { Write-Host "string is not empty" } else { Write-Host "String is EMPTY or NULL" } Most scripts use this method, however we can make things better by using “System.String” dotnet ...
Using the isEmpty() method: The isEmpty() method is a built-in method provided by the String class in Java. 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...
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...
It returns true if the String contains at least one character and false otherwise. It doesn’t treat white spaces as empty: scala> val str1: String = "Hello" scala> val str2: String = "" scala> val str3: String = " " scala> println(str1.isEmpty) // false scala> println(str1...
There are several ways to check a string to see if it’s empty. However, you should try to always use the following method. It’s faster, and uses less resources. This may seem like a minimal piece of code - but if you were checking strings through out your application, it all adds...
// checking if the string is not blank "notEmptyTextString": not isBlank(" 1234"), "notEmptyTextStringTwo": !isBlank("") } Output: { "emptyString": true, "stringWithSpaces": true, "textString": false, "somePayloadValue": true, "nullStr...
b) Any string of any form such as aXYZa can get the "correct answer", where a is either an empty string or a string consisting only of the letter X; c) If aXbZc is true, aXbYZca is also valid, where a, b, c are either empty strings or a string consisting only of the letter...