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I want a function to return TRUE if a string contains only letters, and FALSE otherwise.
I had a hard time finding a solution for this problem using R even though there are many answer pages for other languages.
775
Now for a given string, the characters of the string are checked one by one using Regex. Regex can be used to check a string for alphabets. String. matches() method is used to check whether or not the string matches the given regex.
Use the String. includes() method to check if a string contains a character, e.g. if (str. includes(char)) {} . The include() method will return true if the string contains the provided character, otherwise false is returned.
In order to check if a String has only Unicode letters in Java, we use the isDigit() and charAt() methods with decision-making statements. The isLetter(int codePoint) method determines whether the specific character (Unicode codePoint) is a letter. It returns a boolean value, either true or false.
To check whether a String contains only unicode letters or digits in Java, we use the isLetterOrDigit() method and charAt() method with decision-making statements. The isLetterOrDigit(char ch) method determines whether the specific character (Unicode ch) is either a letter or a digit.
We can use grep. We match letters [A-Za-z] from the start (^) to the end $ of the string.
grepl('^[A-Za-z]+$', str1)
#[1] TRUE FALSE
str1 <- c('Azda', 'A123Zda')
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