tailieunhanh - Professional Information Technology-Programming Book part 101

Tham khảo tài liệu 'professional information technology-programming book part 101', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Send personal email to ben@. For questions about a book use support@. Feel free to send unsolicited email to spam@ wouldn t it be nice if it were that simple huh . w @ w . w Send personal email to ben@. For questions about a book use support@. Feel free to send unsolicited email to spam@ wouldn t it be nice if it were that simple huh . The pattern matched all three addresses correctly. The regular expression first matches one or more alphanumeric characters using w . Next it matches @ followed by one or more characters again using w . It then matches . using the escaped . and another w to match the end of the address. Tip is a metacharacter. To match a you ll need to escape it as . can also be used to match one or more sets of characters. To demonstrate this the following example shows the same regular expression but with slightly different text Send personal email to ben@ or . For questions about a book use support@. If your message is urgent try ben@. Feel free to send unsolicited email to spam@ wouldn t it be nice if it were that simple huh . w @ w . w Send personal email to ben@ or . For questions about a book use support@. If your message is urgent try ben@. Feel free to send unsolicited email to spam@ wouldn t it be nice if it were that simple huh . The regular expression matched five addresses but two of them are incomplete. Why is this w @ w . w makes no accommodations for . characters before the @ and it allows only a single . separating the two strings after the @. Although is a perfectly legal email address the regular expression matched only forta instead of because w matches alphanumeric characters but not a . in the middle of a string of text. What we need here is to match either w or . or in regular expression parlance a set of w . . Following is

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