I want to filter tags out of a description string, and want to make them into anchor tags. I am not able to return the value of the tag.
我想要从描述字符串中过滤标签，并想让它们成为锚定标签。我不能返回标记的值。
My input is:
我的输入:
a = "this is a sample #tag and the string is having a #second tag too"
My output should be:
我的输出应该是:
a = "this is a sample <a href="/tags/tag">#tag</a> and the string is having a <a href="/tags/second">#second</a> tag too"
So far I am able to do some minor stuff but I am not able to achive the final output. This pattern:
到目前为止，我能做一些小事情，但是我不能完成最终的输出。这种模式:
a.gsub(/#\S+/i, "<a href='/tags/\0'>\0</a>")
returns:
返回:
"this is a sample <a href='/tags/\u0000'>\u0000</a> and the string is having a <a href='/tags/\u0000'>\u0000</a> tag too"
What do I need to do differently?
我需要做什么不同的事情?
3 个解决方案
#1
5
You can do it like this:
你可以这样做:
a.gsub(/#(\S+)/, '<a href="/tags/\1">\0</a>')
The reason why your replacement doesn't work is that you must use double escape when you are between double quotes:
替换无效的原因是在双引号之间必须使用双转义:
a.gsub(/#(\S+)/, "<a href='/tags/\\1'>\\0</a>")
Note that the /i modifier is not needed here.
注意这里不需要/i修饰符。
#2
3
You need to give gsub a block if you want to do something with the match from the regex:
如果您想对来自regex的匹配做些什么，您需要给gsub一个块:
a.gsub(/#(\S+)/i) { "<a href='/tags/#{$1}'>##{$1}</a>" }
$1 is a global variable that Ruby automatically fills with the first capture block in the matched string.
$1是一个全局变量，Ruby在匹配的字符串中自动填充第一个捕获块。
#3
1
Try this:
试试这个:
a.gsub(/(?<a>#\w+)/, '<a href="/tags/\k<a>">\k<a></a>')
#1
5
You can do it like this:
你可以这样做:
a.gsub(/#(\S+)/, '<a href="/tags/\1">\0</a>')
The reason why your replacement doesn't work is that you must use double escape when you are between double quotes:
替换无效的原因是在双引号之间必须使用双转义:
a.gsub(/#(\S+)/, "<a href='/tags/\\1'>\\0</a>")
Note that the /i modifier is not needed here.
注意这里不需要/i修饰符。
#2
3
You need to give gsub a block if you want to do something with the match from the regex:
如果您想对来自regex的匹配做些什么，您需要给gsub一个块:
a.gsub(/#(\S+)/i) { "<a href='/tags/#{$1}'>##{$1}</a>" }
$1 is a global variable that Ruby automatically fills with the first capture block in the matched string.
$1是一个全局变量，Ruby在匹配的字符串中自动填充第一个捕获块。
#3
1
Try this:
试试这个:
a.gsub(/(?<a>#\w+)/, '<a href="/tags/\k<a>">\k<a></a>')