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Regular Expressions In Ruby?

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  #1  
Old November 5th, 2006, 12:01 AM
AliasXNeo AliasXNeo is offline
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Regular Expressions In Ruby?
I'm reading a book on Ruby, and I just started a little while ago. I have gotten some decent ground and they just introduced Regular Expressions, but for some reason I can't get them to work. Take this code for example:

Code:
line = "Perl"
line.sub(/Perl/, 'Ruby')
puts line


When I run the code I still see "Perl" getting printed to the string when it should have replaced it with "Ruby". Also, when I do stuff like:

Code:
line = "Yes I like Ruby"
if line =~ /Ruby/
    puts line
end


Instead of printing the index of where the expression starts (like the book says) it just prints out the string again.

Am I doing something wrong?

Cheers,
~ Alias
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  #2  
Old November 5th, 2006, 12:30 AM
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SimonGreenhill SimonGreenhill is offline
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Old November 5th, 2006, 01:58 AM
mawe mawe is offline
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Hi!

2 solutions:
Ruby Code:
Original - Ruby Code 
    line = "Perl"
newline = line.sub(/Perl/, "Ruby")
# or
line.sub!(/Perl/, "Ruby")

line.sub() does not change the original line, line.sub! does.
This is very common in Ruby, other examples are
Code:
chomp  --- chomp!
chop --- chop!
strip --- strip!
...


Regards, mawe
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AliasXNeo agrees: Thanks for the nice help! ~ AliasXNeo
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Old November 5th, 2006, 02:29 AM
AliasXNeo AliasXNeo is offline
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Wow, cleared it up perfectly. Thanks a lot!

Cheers,
~ Alias
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