needle haystack Compiling minigrep v0.1.0 (file:///projects/minigrep) Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.57s Running `target/debug/minigrep needle haystack` [src/main [src/main.rs:5:5] args = [ "target/debug/minigrep", "needle", "haystack", ] 注意 vector 的第一个值是 "target/debug/minigrep"，它是我们二进制文件的名称。这与 C 中 的参数列表的行为相匹配，让程序使用在执行时调用它们的名称。如果要在消息中打印它或者 根据用于调用程序的命令行 match(needle: &str, haystack: &str) -> bool { haystack.contains(needle) } 会得到这个错误： error: expected identifier, found keyword `match` --> src/main.rs:4:4 | 4 | fn match(needle: &str, haystack: &str) -> bool

AbstractPattern,AbstractChar}, haystack::AbstractString) �→ Determine whether the first argument is a substring of the second. If needle is a regular expression, checks whether haystack contains a match. Examples contains. source occursin(haystack) Create a function that checks whether its argument occurs in haystack, i.e. a function equivalent to needle -> occursin(needle, haystack). The returned function is contains(haystack::AbstractString, needle) Return true if haystack contains needle. This is the same as occursin(needle, haystack), but is provided for consistency with startswith(haystack, needle) and

AbstractPattern,AbstractChar}, haystack::AbstractString) �→ Determine whether the first argument is a substring of the second. If needle is a regular expression, checks whether haystack contains a match. Examples contains. source occursin(haystack) Create a function that checks whether its argument occurs in haystack, i.e. a function equivalent to needle -> occursin(needle, haystack). The returned function is contains(haystack::AbstractString, needle) Return true if haystack contains needle. This is the same as occursin(needle, haystack), but is provided for consistency with startswith(haystack, needle) and

AbstractPattern,AbstractChar}, haystack::AbstractString) �→ Determine whether the first argument is a substring of the second. If needle is a regular expression, checks whether haystack contains a match. Examples contains. source occursin(haystack) Create a function that checks whether its argument occurs in haystack, i.e. a function equivalent to needle -> occursin(needle, haystack). The returned function is contains(haystack::AbstractString, needle) Return true if haystack contains needle. This is the same as occursin(needle, haystack), but is provided for consistency with startswith(haystack, needle) and

AbstractPattern,AbstractChar}, haystack::AbstractString) �→ Determine whether the first argument is a substring of the second. If needle is a regular expression, checks whether haystack contains a match. Examples contains. source occursin(haystack) Create a function that checks whether its argument occurs in haystack, i.e. a function equivalent to needle -> occursin(needle, haystack). The returned function is contains(haystack::AbstractString, needle) Return true if haystack contains needle. This is the same as occursin(needle, haystack), but is provided for consistency with startswith(haystack, needle) and

AbstractPattern,AbstractChar}, haystack::AbstractString) �→ Determine whether the first argument is a substring of the second. If needle is a regular expression, checks whether haystack contains a match. Examples contains. source occursin(haystack) Create a function that checks whether its argument occurs in haystack, i.e. a function equivalent to needle -> occursin(needle, haystack). The returned function is contains(haystack::AbstractString, needle) Return true if haystack contains needle. This is the same as occursin(needle, haystack), but is provided for consistency with startswith(haystack, needle) and

occursin – Function. occursin(haystack) Create a function that checks whether its argument occurs in haystack, i.e. a function equivalent to needle -> occursin(needle, haystack). The returned function is AbstractPattern,AbstractChar}, haystack::AbstractString) �→ Determine whether the first argument is a substring of the second. If needle is a regular expression, checks whether haystack contains a match. Examples equivalent to haystack -> contains(haystack, needle). The returned function is of type Base.Fix2{typeof(contains)}, which can be used to implement specialized methods. source contains(haystack::AbstractString

occursin – Function. occursin(haystack) Create a function that checks whether its argument occurs in haystack, i.e. a function equivalent to needle -> occursin(needle, haystack). The returned function is AbstractPattern,AbstractChar}, haystack::AbstractString) �→ Determine whether the first argument is a substring of the second. If needle is a regular expression, checks whether haystack contains a match. ExamplesCHAPTER equivalent to haystack -> contains(haystack, needle). The returned function is of type Base.Fix2{typeof(contains)}, which can be used to implement specialized methods. source contains(haystack::AbstractString

occursin – Function. occursin(haystack) Create a function that checks whether its argument occurs in haystack, i.e. a function equivalent to needle -> occursin(needle, haystack). The returned function is AbstractPattern,AbstractChar}, haystack::AbstractString) �→ Determine whether the first argument is a substring of the second. If needle is a regular expression, checks whether haystack contains a match. ExamplesCHAPTER equivalent to haystack -> contains(haystack, needle). The returned function is of type Base.Fix2{typeof(contains)}, which can be used to implement specialized methods. source contains(haystack::AbstractString

occursin – Function. occursin(haystack) Create a function that checks whether its argument occurs in haystack, i.e. a function equivalent to needle -> occursin(needle, haystack). The returned function is AbstractPattern,AbstractChar}, haystack::AbstractString) �→ Determine whether the first argument is a substring of the second. If needle is a regular expression, checks whether haystack contains a match. ExamplesCHAPTER equivalent to haystack -> contains(haystack, needle). The returned function is of type Base.Fix2{typeof(contains)}, which can be used to implement specialized methods. source contains(haystack::AbstractString