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1£¬°Ñ×Ö·û´®µÄa Ìæ»»³É A
2£¬×Ö·û´®ÖеÄaa ±£³Ö²»±ä
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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¡£
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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);
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AaaasfsfAsdfsaasfdsdfaaaafsfsaaA
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