说我有这样的绳子:
May 12 -
我想最终得到的是:
May 12
我尝试了做一个 gsub (/s+W/) , 并试图去除尾端空间和最后一个连字符 。
但我不知道如何删除 M 之前的第一个空格 。
思念?
使用 match 而不是 gsub (即提取相关字符串,而不是试图剥去无关部分),使用regex /w+(?:W+w+)*/ :
" May 12 - ".match(/w+(?:W+w+)*/).to_s # => "May 12"
请注意,这比使用 gsub < code> match regex < a href=gsub regex 效率高得多,我得到这些基准(重复500万次):
user system total real
match: 19.520000 0.060000 19.580000 ( 22.046307)
gsub: 31.830000 0.120000 31.950000 ( 35.781152)
添加 gstrip! step 的 < code> gstrip! step < a href="
user system total real
match: 19.390000 0.060000 19.450000 ( 20.537461)
gsub.strip!: 30.800000 0.110000 30.910000 ( 34.140044)
使用. strip! 在您的结果上.
" May 12".strip! # => "May 12"
怎么样:
/^s+|s+W+$/
<强 > 解析:
/ : regex delim
^ : begining of string
s+ : 1 or more spaces
| : OR
s+W+ : 1 or more spaces followed by 1 or more non word char
$ : end of string
/ : regex delim
The project I m doing is written in Java and parsers source code files. (Java src up to now). Now I d like to enable parsing Ruby code as well. Therefore I am looking for a parser in Java that parses ...
collection_select and select Rails helpers: Which one should I use? I can t see a difference in both ways. Both helpers take a collection and generates options tags inside a select tag. Is there a ...
All of the following API do the same thing: open a file and call a block for each line. Is there any preference we should use one than another? File.open("file").each_line {|line| puts line} open("...
I ve installed RubyCAS-Client version 2.1.0 as a plugin within a rails app. It s working, but I d like to remove the ?ticket= in the url. Is this possible?
Here s the string: 04046955104021109 I need it to be formatted like so: 040469551-0402-1109 What s the shortest/most efficient way to do that with ruby?
I m building an xml document from a hash. The xml attributes need to be in order. How can this be accomplished? hash.to_xml
Can sources for discrete ruby extension modules live in the same directory, controlled by the same extconf.rb script? Background: I ve a project with two extension modules, foo.so and bar.so which ...
guys which text editor is good for Rubyonrails? i m using Windows and i was using E-Texteditor but its not free n its expired now can anyone plese tell me any free texteditor? n which one is best an ...