regex issue

[Junkone]

my pattern should match either import or delete
However it does not seem to be working.

irb(main):014:0> pattern="([import]|[delete])"
=> "([import]|[delete])"
irb(main):015:0> pattern.match("import")
=> #<MatchData:0x2e76f9c>
irb(main):016:0> $1
=> nil

 

[Stefano Crocco]

Alle Friday 25 January 2008, Junkone ha scritto:

my pattern should match either import or delete
However it does not seem to be working.

irb(main):014:0> pattern="([import]|[delete])"
=> "([import]|[delete])"
irb(main):015:0> pattern.match("import")
=> #<MatchData:0x2e76f9c>
irb(main):016:0> $1
=> nil

I see two problems with your code:
1) if you want to check that a string (in your case, 'import') matches a
pattern, you need to use

string.match(pattern)

which, in your case, is

'import'.match(pattern)

2) in a regexp, the construct [abc] means one character among 'a', 'b' or 'c',
not (as I guess you think) the string 'abc'. Because of this, the string 'i'
matches your pattern:

'i'.match(pattern)
=> #<MatchData:0xb7bbed44>

To do what you want, you simply need:

pattern = "(import|delete")
"import".match pattern
=>#<MatchData:0xb7bb7cb0>
$1
=> "import"

I hope this helps

Stefano

 

[Jesús Gabriel y Galán]

my pattern should match either import or delete
However it does not seem to be working.

irb(main):014:0> pattern="([import]|[delete])"
=> "([import]|[delete])"
irb(main):015:0> pattern.match("import")
=> #<MatchData:0x2e76f9c>
irb(main):016:0> $1
=> nil

Try this:

irb(main):004:0> pattern=/(import|delete)/
=> /(import|delete)/
irb(main):005:0> pattern.match "import"
=> #<MatchData:0xb7cd1434>
irb(main):006:0> $1
=> "import"

Pattern should be a regular expression. Also I think you don't want
square brackets, because that means matching any one character in the
set, not the word.

Jesus.

 

[Lee Jarvis]

You don't need parenthesis..

pattern = 'import|delete' => "import|delete"
'import'.match(pattern)[0] => "import"
'delete'.match(pattern)[0]

=> "delete"


Regards,
Lee