String parse

ruby-talk
1

Hello,

I want to be able to parse a string and put them into variables.

for example, I have this string:

"Menu: steak_and_egg | date: 0814 | who: Anita"

I want to parse this string to assign variables like so:

menu = "steak_and_egg"
date = "0814"
who = "Anita"

What would be the fastest way of doing this.

Thanks

2

Hello,

I want to be able to parse a string and put them into variables.

for example, I have this string:

"Menu: steak_and_egg | date: 0814 | who: Anita"

I want to parse this string to assign variables like so:

menu = "steak_and_egg"
date = "0814"
who = "Anita"

What would be the fastest way of doing this.

This might work if your data isn't too complicated:

>> str = "Menu: steak_and_egg | date: 0814 | who: Anita"
=> "Menu: steak_and_egg | date: 0814 | who: Anita"
>> Hash[*str.scan(/(\w+):\s*(\w+)/).flatten]
=> {"date"=>"0814", "who"=>"Anita", "Menu"=>"steak_and_egg"}

James Edward Gray II

···

On Aug 14, 2007, at 6:00 PM, anitawa wrote:

3

This is a CSV format, You can use the csv lib from the stdlib :

# parse with : and | as delimiters
str = "Menu: steak_and_egg | date: 0814 | who: Anita"
parsed = CSV.parse(str, ":", "|")
=> [["Menu", " steak_and_egg "], [" date", " 0814 "], [" who", " Anita"]]

# then, put the results in a hash
res = {}
parsed.each do |k, v|
res[k.strip] = v.strip
end
=> {"date"=>"0814", "who"=>"Anita", "Menu"=>"steak_and_egg"}

You can also use Enumerable#inject for putting in the Hash (or Hash:: with
some adaptations)

···

Le mercredi 15 août 2007 01:00, anitawa a écrit :

Hello,

I want to be able to parse a string and put them into variables.

for example, I have this string:

"Menu: steak_and_egg | date: 0814 | who: Anita"

I want to parse this string to assign variables like so:

menu = "steak_and_egg"
date = "0814"
who = "Anita"

What would be the fastest way of doing this.

Thanks

--
Olivier Renaud

4

James Edward Gray II wrote:

···

On Aug 14, 2007, at 6:00 PM, anitawa wrote:

Hello,

I want to be able to parse a string and put them into variables.

for example, I have this string:

"Menu: steak_and_egg | date: 0814 | who: Anita"

I want to parse this string to assign variables like so:

menu = "steak_and_egg"
date = "0814"
who = "Anita"

What would be the fastest way of doing this.

This might work if your data isn't too complicated:

>> str = "Menu: steak_and_egg | date: 0814 | who: Anita"
=> "Menu: steak_and_egg | date: 0814 | who: Anita"
>> Hash[*str.scan(/(\w+):\s*(\w+)/).flatten]
=> {"date"=>"0814", "who"=>"Anita", "Menu"=>"steak_and_egg"}

Might be more general than is needed. If you know in advance that the "fields" are menu, date, and who, then this will do:

str = "Menu: steak_and_egg | date: 0814 | who: Anita"
pat = /Menu: (\S+) \| date: (\S+) \| who: (\S+)/

menu, date, who = str.scan(pat)[0]

--
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

5

Thanks, just what i was looking for

···

On Aug 14, 8:12 pm, Joel VanderWerf <vj...@path.berkeley.edu> wrote:

James Edward Gray II wrote:

> On Aug 14, 2007, at 6:00 PM, anitawa wrote:

>> Hello,

>> I want to be able to parse a string and put them into variables.

>> for example, I have this string:

>> "Menu: steak_and_egg | date: 0814 | who: Anita"

>> I want to parse this string to assign variables like so:

>> menu = "steak_and_egg"
>> date = "0814"
>> who = "Anita"

>> What would be the fastest way of doing this.

> This might work if your data isn't too complicated:

> >> str = "Menu: steak_and_egg | date: 0814 | who: Anita"
> => "Menu: steak_and_egg | date: 0814 | who: Anita"
> >> Hash[*str.scan(/(\w+):\s*(\w+)/).flatten]
> => {"date"=>"0814", "who"=>"Anita", "Menu"=>"steak_and_egg"}

Might be more general than is needed. If you know in advance that the
"fields" are menu, date, and who, then this will do:

str = "Menu: steak_and_egg | date: 0814 | who: Anita"
pat = /Menu: (\S+) \| date: (\S+) \| who: (\S+)/

menu, date, who = str.scan(pat)[0]

--
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407