iphone - 如何使用 componentsSeparatedByString :? 忽略包含子字符串的单词

Question

我想使用 -componentsSeparatedByString: 解析以下字符串:

     CHAPTER 5. RULE OF DECISION
 CHAPTER 6. GOVERNMENTAL EXEMPTION FROM BOND AND SECURITY REQUIREMENTS
 CHAPTER 7. LIABILITY OF COURT OFFICERS
     SUBCHAPTER A. LIABILITY OF OFFICER
     SUBCHAPTER B. LIABILITY OF ATTORNEY
     SUBCHAPTER C. SUIT ON OFFICIAL BONDS
 CHAPTER 8. STATE EXEMPTION FROM CERTAIN FEES: FEES PAID BY OPPOSING PARTY
 CHAPTER 9. FRIVOLOUS PLEADINGS AND CLAIMS
     SUBCHAPTER A. GENERAL PROVISIONS
     SUBCHAPTER B. SIGNING OF PLEADINGS
 CHAPTER 10. SANCTIONS FOR FRIVOLOUS PLEADINGS AND MOTIONS

但是当我使用 CHAPTER 作为分隔符的字符串时，SUBCHAPTER 元素也会被分解，因为它们包含 CHAPTER。

在使用 -componentsSeparatedByString: 解析 CHAPTER 元素时，如何避免在 SUBCHAPTER 元素上停止？

Answer 1

尝试使用 regular expressions regexKit is perfect for this .这将帮助您形成您正在寻找的确切模式...

NSString *regex      = @"^CHAPTER [0-9]";
NSPredicate *valtest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex]; 
ret                  = [valtest evaluateWithObject:yourText];
NSLog("Matches: %@", ret);