使用Ruby从字符串中删除双反斜杠

Question

I have the following string:

string = "\"2014\\/jul\\/grandes\\/volvo-s-60-d5-momentum-1403253_2.jpg\""

that I want to gsub into this string:

string = "2014/jul/grandes/volvo-s-60-d5-momentum-1403253_2.jpg"

Here is how I thought it should work:

string.gsub(/\\./,'')

but this returns:

"\"2014julgrandesvolvo-s-60-d5-momentum-1403253_3.jpg\""

What am I doing wrong?

Answer 1

You have a “dot” in regexp for no reason. Instead of:

string.gsub(/\\./,'')

try:

string.gsub(/["\\]/,'')

Or, credits to @sawa, try this instead:

string.tr('"\\','')

Or, credits to @Chirantan:

string.delete('"\\')

Benchmarks: http://gist.github.com/dominikh/208915

Answer 2

string.delete('\\\"')

is one possible solution. But I'm sure there are better ones out there.

Answer 3

Another nasty one using String#[]= method. This is just for fun :-

string[/["\\]/] = '' until string[/["\\]/].nil?
# or
string[/["\\]/] = '' while string =~ /["\\]/

But #gsub is better way to solve this. If you don't want to modify the original string , then use String#slice instead of String#[]= . That's it.