ruby - 如何使用 $ 持有人将正则表达式中每个句子的第一个字母大写？

Question

我有这样的字符串：

      THiS is a Li?ne of text  
   !THiS is a Line of text    
((THiS is a Line of text.X    
    THiS is a Line of text  

我想将每一行大写，但保持其原始形式。

到目前为止，我有：

puts the_string.gsub(/(^\W*?)([a-z])/) { |x| "#{$2.capitalize}"}

但这摆脱了空白。

Answer 1

你没有处理这个词的其余部分：

lines = [
  " THiS is a Li?ne of text",
  "!THiS is a Line of text",
  "((THiS is a Line of text.X",
  "THiS is a Line of text"
]

lines.each do |line|
  puts line.gsub(/(\w+)/) { $1.capitalize }
end

# =>  This Is A Li?Ne Of Text  
# => !This Is A Line Of Text    
# => ((This Is A Line Of Text.X    
# => This Is A Line Of Text

Answer 2

不确定您到底要达到什么目标，但这可能会有所帮助：

puts the_string.gsub(/(^\W*?)([a-z])/) { |x| "#{$1}#{$2.capitalize}"}

这也将第一个捕获的组（即空格）放回结果字符串中。

Answer 3

string = <<_
      THiS is a Li?ne of text  
   !THiS is a Line of text    
((THiS is a Line of text.X    
    THiS is a Line of text  
_

string.gsub(/\w.*/, &:capitalize)
# =>
#      This is a li?ne of text  
#   !This is a line of text    
#((This is a line of text.x    
#    This is a line of text