如何检查WHOLE字符串是否可以匹配正则表达式?在Java中是方法String.matches(regex)
您需要使用锚点,^(字符串锚点的开头)和$(字符串锚点的结尾),使用
range(of:options:range:locale:)
,传递.regularExpression选项:
- import Foundation
- let phoneNumber = "123-456-789"
- let result = phoneNumber.range(of: "^\\d{3}-\\d{3}-\\d{3}$",options: .regularExpression) != nil
- print(result)
或者,您可以传递一个选项数组,[.regularExpression,.anchored],其中.anchored
将仅在字符串的开头锚定模式,并且您将能够省略^,但仍然需要$来锚定在字符串末尾:
- let result = phoneNumber.range(of: "\\d{3}-\\d{3}-\\d{3}$",options: [.regularExpression,.anchored]) != nil
此外,使用NSPredicate与MATCHES
是另一种选择:
The left hand expression equals the right hand expression using a regex-style comparison according to ICU v3 (for more details see the ICU User Guide for 07004).
MATCHES实际上在字符串的开头和结尾都锚定了正则表达式匹配(请注意,这可能不适用于所有Swift 3版本):
- let pattern = "\\d{3}-\\d{3}-\\d{3}"
- let predicate = NSPredicate(format: "self MATCHES [c] %@",pattern)
- let result = predicate.evaluate(with: "123-456-789")