问题描述
我想知道是否有一种直接的方法可以知道给定的子字符串是否存在于一个字符串中严格 中间(即)不是开始而不是结束,但是字符串中包含的某处。
substring = "trees"
input1 = "sketchthetreesanddaffodils"
input2 = "treesaregreen"
input3 = "greentrees"
input4 = "greentreesareoftengreenertrees"
output1 = True
output2 = False # 'trees' appearing at the beginning though
output3 = False # 'trees' appearing at the end though
output4 = True # 'trees' appear in middle,regardless of the one in the end
预期操作
str.containsinmiddle()
#Something similar to str.startswith(),str.endswith()
解决方法
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