在Ruby中,可以使用gsub方法在String(字符串)中进行条件替换。 gsub方法是Ruby中String类的一个方法,用于全局替换字符串中的匹配项。它接受两个参数:第一个参数是要替换的模式(可以是字符串或正则表达式),第二个参数是替换后的内容。 使用gsub方法进行条件替换的基本语法如下: 代码语言:ruby 复制 string.gsub(patte...
string[0,3]# "abc"string[3,3]# "123"string[0..-2]# "abc12"#remove or replace the substringstring[0..2] = ""puts string# "123" 子字符串是字符串的一小部分,如果你只想要那个特定的部分,它会很有用,比如开头、中间或结尾 将字符串转换为小写或大写 1234 "HELLO World".downcase # "...
myString[0..6] => "Welcome" The location of a matching substring can be obtained using the index method: myString.index("Ruby") => 11 Comparing Ruby Strings It is not uncommon to need to compare two strings, either to assess equality or to find out if one string is higher or ...
The next method is where all the action is and it's a doozy, so we will take it in pieces. The first chunk builds and sorts the suffix tree:ruby # ... def longest_repeated_substring(string) size = string.length suffixes = Array.new(size) size.times do |i| suffixes[i] = string...
In addition to looking for characters in a string, you can check to see if a string starts with a character or substring using thestart_with?method: text="Sammy has a balloon"text.start_with?("s")# truetext.start_with?("Sammy has"# true ...
for Linux tryhttp://www.rpmfind.net. Our first program(从此开始) Enter the following into the file, "test.rb". 1 puts"Howdy!" At the C: prompt enter, 1 C:>ruby test.rb This produces: 1 Howdy! OK, daylight's burning, let's move on. ...
for Linux tryhttp://www.rpmfind.net. Our first program(从此开始) Enter the following into the file, "test.rb". 1 puts"Howdy!" At the C: prompt enter, 1 C:>ruby test.rb This produces: 1 Howdy! OK, daylight's burning, let's move on. ...
The substring functionIt's quite easy to find the substring of a string in Ruby. We just need to specify the start index and length along the string, as shown in the following example:irb(main):001:0> a= "12345678"=> "12345678"...
4 $` The String preceding whatever was matched by the last successful pattern match in the current scope, or nil if the last pattern match failed. (Mnemonic: ` often precedes a quoted string.) This variable is read-only. 5 $' The String following whatever was matched by the last successf...
RE2 was designed and implemented with an explicit goal of being able to handle regular expressions from untrusted users without risk. One of its primary guarantees is that the match time is linear in the length of the input string. It was also written with production concerns in mind: the ...