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1£¬°Ñ×Ö·û´®µÄa Ìæ»»³É A
2£¬×Ö·û´®ÖеÄaa ±£³Ö²»±ä
3£¬¶ÔÓÚaaa£¬Á¬ÔÚÒ»ÆðµÄ»°£¬·ÖΪÁ½ÖÖÇé¿ö£º
    3.1£¬Èç¹ûÔÚ¿ªÍ·£º¾Í±ä³ÉAaa
  3.2£¬Èç¹ûÔÚ½áβ£º¾Í±ä³ÉaaA

Eample:
×Ö·û´®£º aaabcdaeaakaaa
Òª±ä³É: AaabcdAeaakaaA

ÇëÎÊ£¬ÕâÑùµÄ×Ö·û´®Ó¦¸ÃÔõÑùÐ´ÄØ£¿

Ê×ÏÈ£¬Æ¥Åä a{1},È«²¿Ìæ»»³ÉA
È»ºó£¬Æ¥Åä ^a{3,}.$,½«µÚÒ»¸ö×Ö·ûÌæ»»³ÉA
    Æ¥Åä ^.a{3,)$,½«×îºóÒ»¸ö×Ö·ûÌæ»»³ÉA¡£

ÒýÓÃ
Ê×ÏÈ£¬Æ¥Åä a{1},È«²¿Ìæ»»³ÉA
È»ºó£¬Æ¥Åä ^a{3,}.$,½«µÚÒ»¸ö×Ö·ûÌæ»»³ÉA
    Æ¥Åä ^.a{3,)$,½«×îºóÒ»¸ö×Ö·ûÌæ»»³ÉA¡£

ÄãÕâ¸öÊ×ÏÈ£¬¾Í°ÑËùÓеÄaÈ«²¿Ìæ»»³ÉÁËA£¬ÒÔºóÔÙÒ²ÕÒ²»µ½aÁË

Java code:
String s = "aaaasfsfasdfsaasfdsdfaaaafsfsaaa";
s = s.replaceAll("([^a]+)a([^a]+)", "$1A$2");
s = s.replaceAll("^aaa", "Aaa");
s = s.replaceAll("aaa$", "aaA");
System.out.println(s);


Êä³ö½á¹û£º
AaaasfsfAsdfsaasfdsdfaaaafsfsaaA

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  I AGREEed 2F

ÒýÓÃ
Java codeString s="aaaasfsfasdfsaasfdsdfaaaafsfsaaa";
s= s.replaceAll("([^a]+)a([^a]+)","$1A$2");
s= s.replaceAll("^aaa&qu


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