Check if char in string?

[globalrev]

how do i do this:

str = "you muppet"

if "y" in str:
print "its in there"


whats the best source for documentation on Ruby? i googled and checked
the homepage of ruby but there isnt really a clear one or im jus
duuumb.

 

[Marc Heiler]

how do i do this:

str = "you muppet"

if "y" in str:
print "its in there"


whats the best source for documentation on Ruby? i googled and checked
the homepage of ruby but there isnt really a clear one or im jus
duuumb.

str = "you muppet"
puts "its in there" if str.include? 'y'

 

[Stefano Crocco]

whats the best source for documentation on Ruby? i googled and checked
the homepage of ruby but there isnt really a clear one or im jus
duuumb.

http://www.ruby-doc.org/docs/ProgrammingRuby/

http://www.ruby-doc.org/core (reference for the core classes)

http://www.ruby-doc.org/stdlib/ (reference for the standard library)

Stefano

 

[Sandro Paganotti]

you can use also Regular Expression:

!("ciao" =~ /i/).nil?
#=> true

 

[globalrev]

str = "you muppet"
puts "its in there" if str.include? 'y'

hmm it only works for one character though. i want to do:
if x in 'aeiouy':
do this
else:
do that

 

[matt neuburg]

how do i do this:

str = "you muppet"

if "y" in str:
print "its in there"

I always use regex in this situation:

if str =~ /y/

m.

 

[globalrev]

I always use regex in this situation:

if str =~ /y/

m.

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but none of that is what i want to do.

i want to chekc if a char is in a string.
not check if a char equals another char.

 

[Joel VanderWerf]

On 7 Maj, 19:39, (e-mail address removed) (matt neuburg) wrote: ... ...
but none of that is what i want to do.

i want to chekc if a char is in a string.
not check if a char equals another char.

Try the suggestion, you may be surprised

 

[Daniel Finnie]

[Note: parts of this message were removed to make it a legal post.]

The expression he gave uses the =~ operator, not the == operator. It will
work if you try it in IRB (which I suggest you do before you post next
time)...

Dan

 

[matt neuburg]

but none of that is what i want to do.

i want to chekc if a char is in a string.
not check if a char equals another char.

Try it!

m.

 

[Todd Benson]

but none of that is what i want to do.

i want to chekc if a char is in a string.
not check if a char equals another char.

Along with the other suggestions, it might help you to read up on
regular expressions and what Ruby considers as true for a condition.

3 == false # false
3 == true # false

if 3; puts 'hi'; end # hi
if {}; puts 'hi'; end # hi
if []; puts 'hi'; end # hi

Todd

 

[RedWiz]

but none of that is what i want to do.

i want to chekc if a char is in a string.
not check if a char equals another char.

ok, you don't know regexp

do it

 

[globalrev]

ok, you don't know regexp

do it

but
if str =~ /aeiouy/
do foo
end

doesnt work. or i mena it works but iw ant to chekc if it is a vowel
not if contains the expr aeiouy.
how do i delimit the expressins?

 

[Joel VanderWerf]

but
if str =~ /aeiouy/
do foo
end

doesnt work. or i mena it works but iw ant to chekc if it is a vowel
not if contains the expr aeiouy.
how do i delimit the expressins?

str =~ /[aeiouy]/

This checks if str contains one of those chars. Regular expressions are
worth learning more about.

 

[Tim Hunter]

but
if str =~ /aeiouy/
do foo
end

doesnt work. or i mena it works but iw ant to chekc if it is a vowel
not if contains the expr aeiouy.
how do i delimit the expressins?

if str =~ /[aeiouy]/
do foo
end

[aeiouy] is a "character class". The regular expression tests if any
character in the string is in the class.

 

[Todd Benson]

but
if str =~ /aeiouy/
do foo
end

doesnt work. or i mena it works but iw ant to chekc if it is a vowel
not if contains the expr aeiouy.
how do i delimit the expressins?

if str =~ /[aeiouy]/
do foo
end

[aeiouy] is a "character class". The regular expression tests if any
character in the string is in the class.

Get a good book on regular expressions. Trust me, it will seriously
help you in the long run for most any type of programming/system
interaction. If you want a quick look at some syntax,
http://www.regular-expressions.info might help. Note that, this is
only one of many ways to do what you are trying to do, but I think it
is the best way for this case.

hth,
Todd

 

[Todd Benson]

globalrev wrote:

if str =~ /[aeiouy]/
do foo
end

[aeiouy] is a "character class". The regular expression tests if any
character in the string is in the class.

Get a good book on regular expressions. Trust me, it will seriously
help you in the long run for most any type of programming/system
interaction. If you want a quick look at some syntax,
http://www.regular-expressions.info might help. Note that, this is
only one of many ways to do what you are trying to do, but I think it
is the best way for this case.

Hmm..hmm (cough). I was talking to globalrev, not Tim :/

Todd

 

[globalrev]

this way:
if str[x].chr =~ /[aeiouy]/
i can see if a char is any of the chars aeioyu

but i want to see if its not...
if str[x].chr !=~ /[aeiouy]/

doesnt work though...


and why cant i print [ in the windows ruby prompt?

 

[Heesob Park]

Hi,

this way:
if str[x].chr =~ /[aeiouy]/
i can see if a char is any of the chars aeioyu

but i want to see if its not...
if str[x].chr !=~ /[aeiouy]/

doesnt work though...

You can do like this:
if str[x].chr !~ /[aeiouy]/

Or
unless str[x].chr =~ /[aeiouy]/


Regards,
Park Heesob

 

[Jim Cochrane]

this way:
if str[x].chr =~ /[aeiouy]/
i can see if a char is any of the chars aeioyu

but i want to see if its not...
if str[x].chr !=~ /[aeiouy]/

how about something like:

if not str[x].chr =~ /[aeiouy]/ then print "YO\n" end


OR


if str[x].chr !~ /[aeiouy]/ then print "YO\n" end


--