string = "Jack and Jill went up the hill to fetch a pail of water. Jack fell down and broke his crown. And Jill came tumbling after. "
d = string.match(/(jack|jill)/i) # -> MatchData "Jill" 1:"Jill"
d.size # -> 1
string = "Jack and Jill went up the hill to fet
阅读背景：
如何获取字符串中所有模式的索引
来源：互联网
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