CODEWITHSUNDEEP
rubyregexstringgsub
aprok
aprok

Reputation: 1157

Regex to match string excluding first character

I'm writing ruby and need some help with regex. And I'm really noob in regexp. I have a string like this 

/hello/world

I would like to #gsub this string to change the second slash to %2F. The challange for me to ignore the first slash and to change only the second slash. I tried this one

[^/]/

but it chooses not clean slash but o/ in 

/hello/world

Please, help me. Thanks!!

Upvotes: 3

Views: 8972

Answers (5)

pguardiario
pguardiario

Reputation: 54984

change the second / to %2F:

'/hello/world'.sub /(\/.*?)\//, '\1%2F'
#=> "/hello%2Fworld"

Upvotes: 0

p.s.w.g
p.s.w.g

Reputation: 149010

You can simply capture the character before the slash in a group and use that in the replacement, for example:

"/hello/world".gsub(/([^\/])\//, '\1%2F') #=> "/hello%2Fworld"

Or if you just want to match any / that appears after the first character, you can simplify this to:

"/hello/world".gsub(/(.)\//, '\1%2F')     #=> "/hello%2Fworld"

Or like this:

"/hello/world".gsub(/(?<!^)\//, '%2F')    #=> "/hello%2Fworld"

Upvotes: 3

DiegoSalazar
DiegoSalazar

Reputation: 13521

And now for an uglier, regexless alternative:

"/hello/world".split("/").tap(&:shift).unshift("/").join("")

I'll see myself out.

Upvotes: 2

cggaurav
cggaurav

Reputation: 575

(?!^\/)\/

http://rubular.com/r/IRWptAJdLs is a a working example.

Upvotes: 1

Victor Bocharsky
Victor Bocharsky

Reputation: 12306

You need to use subpattern within () for find substring:

/^\/(.*)$/

or

/^.(.*)$/

this pattern excluding first character. And then replace / in this substring

Upvotes: 1

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