Parsing a string

Ruby
1

Hi,

i am new to ruby and am facing with problem in handling string.

I have a string like
cap[?]

and i want to extract only cap, anything before <.

How can i manage to get the required string i.e. cap from cap[?].

Please help with ur suggestion.

Thanks
Saurbah

2

hi Saurbah,

try String#split…

string = ‘cap[?]’
array = string.split(‘<’)
puts array[0]
=> cap

check out the methods available for String here:
http://ruby-doc.org/core/classes/String.html#M001165

  • j
3

jake kaiden wrote in post #1007092:

array = string.split(’<’)
puts array[0]
=> cap

Hi jake,

You can add a limit argument to split(), which will make it more
efficient:

str = ‘cap[?]’

start, the_rest = str.split(’<’, 2)
puts start

–output:–
cap

Using regexes is also a way to do it:

str = ‘cap[?]’

md = str.match(/[^<]+/)
puts md[0]

–output:–
cap

4

7stud – wrote in post #1007143:

You can add a limit argument to split(), which will make it more
efficient:

nice one! thanks for the tip - certainly is more efficient… regex
is a good way to go too.

  • j
5

7stud – wrote in post #1007143:

jake kaiden wrote in post #1007092:

array = string.split(’<’)
puts array[0]
=> cap

Hi jake,

You can add a limit argument to split(), which will make it more
efficient:

str = ‘cap[?]’

start, the_rest = str.split(’<’, 2)
puts start

–output:–
cap

Using regexes is also a way to do it:

str = ‘cap[?]’

md = str.match(/[^<]+/)
puts md[0]

–output:–
cap

Thanks for the reply. It was really helpful.
There is some more complication. I have string like

str = ‘cap[?] the tap’
and i want to get
str = cap the tap

how can we do it. Please help.

Can you please tell me, the good reading material of regex. I am very
new to ruby.

Thanks. Please help me.

6

Saurabh A. wrote in post #1007238:

str = ‘cap[?] the tap’
and i want to get
str = cap the tap

how can we do it. Please help.

str = ‘cap[?] the tap’

pieces = str.split(/
<
.+
>
/xms)

puts pieces.join

–output:–
cap the tap

Can you please tell me, the good reading material of regex. I am very
new to ruby.

Beginning Ruby: From Novice to Professional (2nd) by Cooper
Programming Ruby 1.9

And there are plenty of tutorials on the web.