Use to make the letter optional. {1} is redundant. (Of course you could also write [A-Z]{0,1} which would mean the same, but that’s what the ? is there for.) You could improve your regex to And, since in most regex dialects, \d is the same as [0-9]: But: do you really need 11 separate capturing groups? And if so, why don’t you capture the … Read more
\r = CR (Carriage Return) → Used as a new line character in Mac OS before X \n = LF (Line Feed) → Used as a new line character in Unix/Mac OS X \r\n = CR + LF → Used as a new line character in Windows
To start you off on your assignment, String.split splits strings on a regular expression and this expression may be an empty string: Yields the array: Getting rid of the empty 1st entry is left as an exercise for the reader 🙂 Note: In Java 8, the empty first element is no longer included.
Use the strconv package’s Itoa function. For example: You can concat strings simply by +‘ing them, or by using the Join function of the strings package.
What is difference in a string between \r\n, \r and \n? How is a string affected by each? I have to replace the occurrences of \r\n and \r with \n, but I cannot get how are they different in a string… I know that \r is like hitting enter and \n is for a new … Read more
No, there’s no direct not operator. At least not the way you hope for. You can use a zero-width negative lookahead, however: The (?!…) part means “only match if the text following (hence: lookahead) this doesn’t (hence: negative) match this. But it doesn’t actually consume the characters it matches (hence: zero-width). There are actually 4 … Read more
Use cut: More generic:
The -match operator tests a regex, combine it with the magic variable $matches to get your result Whenever in doubt about regex-y things, check out this site: http://www.regular-expressions.info
No, there’s no direct not operator. At least not the way you hope for. You can use a zero-width negative lookahead, however: The (?!…) part means “only match if the text following (hence: lookahead) this doesn’t (hence: negative) match this. But it doesn’t actually consume the characters it matches (hence: zero-width). There are actually 4 combinations of lookarounds with 2 axes: lookbehind / lookahead : … Read more
There are two functions that give an object’s string representation, repr() and str(). The former is designed to convert the object to as-code string, while the latter gives user-friendly string. When you input the variable name in the command line, repr() is used, and \n character is shown as \n (as-code). When you use print, … Read more