Julia之初体验（九）字符串连接与匹配

 

串联是最常见和有用的字符串操作之一：

julia> greet = "Hello"
"Hello"

julia> whom = "world"
"world"

julia> string(greet, ", ", whom, ".\n")
"Hello, world.\n"

julia> a, b = "\xe2\x88", "\x80"
("\xe2\x88", "\x80")

julia> c = a*b
"∀"

julia> collect.([a, b, c])
3-element Array{Array{Char,1},1}:
 ['\xe2\x88']
 ['\x80']
 ['∀']

julia> length.([a, b, c])
3-element Array{Int64,1}:
 1
 1
 1

 

julia> greet * ", " * whom * ".\n"
"Hello, world.\n"

 

插补
但是，使用串联构造字符串可能会变得有些麻烦。 为了减少对字符串或重复乘法的这些冗长调用的需要，Julia允许使用$内插到字符串文字中，如Perl中所示：

注意：这个很有用！！！用$符！！

julia> "$greet, $whom.\n"
"Hello, world.\n"

julia> "1 + 2 = $(1 + 2)"
"1 + 2 = 3"

julia> v = [1,2,3]
3-element Array{Int64,1}:
 1
 2
 3

julia> "v: $v"
"v: [1, 2, 3]"

julia&