最大匹配模式
X? X, once or not at all
X* X, zero or more times
X+ X, one or more times
X{n} X, exactly n times
X{n,} X, at least n times
X{n,m} X, at least n but not more than m times
最小匹配模式
X?? X, once or not at all
X*? X, zero or more times
X+? X, one or more times
X{n}? X, exactly n times
X{n,}? X, at least n times
X{n,m}? X, at least n but not more than m times
正则表达式写过很多,javascript貌似默认为最小匹配的。一直不知道JAVA正则的最小匹配需要在后面加个?号。这里给自己做一下笔记。
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