tailieunhanh - Professional Information Technology-Programming Book part 97

Tham khảo tài liệu 'professional information technology-programming book part 97', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | sal. xls ns a 0123456789 .xls sam. xls In this example the pattern has been modified so that the first character would have to be either n or s the second character would have to be a and the third could be any digit specified as 0123456789 . Notice that file was not matched because m did not match the list of allowed characters the 10 digits . When working with regular expressions you will find that you frequently specify ranges of characters 0 through 9 A through Z and so on . To simplify working with character ranges regex provides a special metacharacter - hyphen is used to specify a range. Following is the same example this time using a range ns a 0-9 .xls Pattern 0-9 is functionally equivalent to 0123456789 and so the results are identical to those in the previous example. Ranges are not limited to digits. The following are all valid ranges A-Z matches all uppercase characters from A to Z. a-z matches all lowercase characters from a to z. A-F matches only uppercase characters A to F. A-z matches all characters between ASCII A to ASCII z you should probably never use this pattern because it also includes characters such as and A which fall between Z and a in the ASCII table

crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.