Julia findprev()用法及代码示例

这个findprev()是 julia 中的一个内置函数，用于返回从指定位置开始的指定字符串中指定模式的前一次出现。

用法：
findnprev(pattern::AbstractString, string::AbstractString, start::Integer)

参数：

模式::抽象字符串:指定花样
字符串::抽象字符串:指定字符串
开始::整数：它是将要执行匹配的起始位置。

返回值：它返回从指定位置开始的指定字符串中指定模式的上一次出现。

范例1：


# Julia program to illustrate 
# the use of String findprev() method
   
# Here the pattern is "g", String is
# "geeks" and position is 3
Println(findprev("g", "geeks", 3))
  
# Here the pattern is "G", String is
# "GeeksforGeeks" and position is 10
Println(findprev("G", "GeeksforGeeks", 10))
  
# Here the pattern is "for", String is
# "GeeksforGeeks" and position is 8
Println(findprev("for", "GeeksforGeeks", 8))
  
# Here the pattern is "k", String is
# "GeeksforGeeks" and position is 7
Println(findprev("k", "GeeksforGeeks", 7))

输出：

范例2：


# Julia program to illustrate 
# the use of String findprev() method
   
# Here the pattern is "23", String is
# "12345" and position is 5
Println(findprev("23", "12345", 5))
  
# Here the pattern is "23", String is
# "12345" and position is 4
Println(findprev("23", "12345", 4))
  
# Here the pattern is "3", String is
# "123123" and position is 6
Println(findprev("3", "123123", 6))
  
# Here the pattern is "123", String is
# "123123123" and position is 7
Println(findprev("123", "123123123", 7))

输出：

相关用法

注：本文由纯净天空筛选整理自Kanchan_Ray大神的英文原创作品 Find the previous occurrence of pattern in string in Julia – findprev() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。