Hi,
Can anyone explain to me this regular expression, please:
str[/\A([a-z]\w*)/, 1]
what's the use of 1 in this expression
regards,
···
--
Posted via http://www.ruby-forum.com/.
Hello,
This syntax is used to return the matching portion of supplied regxp. For
example:
"hello world"[/(\w+)(\s)(\w+)/, 0] #=> "hello world"
"hello world"[/(\w+)(\s)(\w+)/, 1] #=> "hello"
"hello world"[/(\w+)(\s)(\w+)/, 2] #=> " "
"hello world"[/(\w+)(\s)(\w+)/, 3] #=> "world"
···
On Mon, Nov 21, 2011 at 5:02 PM, rubix Rubix <aggouni2002@yahoo.fr> wrote:
Hi,
Can anyone explain to me this regular expression, please:
str[/\A([a-z]\w*)/, 1]what's the use of 1 in this expression
regards,--
Posted via http://www.ruby-forum.com/\.
--
Life is a miracle.
Check out the documentation:
ri String#
When given a regular expression and a fixnum, you're matching the string against the regular expression and returning the capturing group indicated by the fixnum. That is to say, your example will match a word beginning with a lower case letter at the beginning of the string. Since \A is an anchor and therefore not part of the matched string and if I am not mistaken, your expression is actually equivalent to just
str[/\A[a-z]\w*/]
If there is a particular reason for using the capturing group over the entire expression there you should probably add a comment to document it!
Sylvester
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On Nov 21, 2011, at 11:02 PM, rubix Rubix wrote:
Hi,
Can anyone explain to me this regular expression, please:
str[/\A([a-z]\w*)/, 1]
Thank you for your answer
I am using this code to parse a text to search the first word and see if
the word is one of the words of an array of strings and then increment
an index with the size of the word to parse the rest of the text
It is working good but when I try it with unicode characters, I obtain
the letters of the first word and not the hole first word:
str[/[\u0627-\u064A]+/,1]
best regards,
···
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Posted via http://www.ruby-forum.com/.
I am using this code to parse a text to search the first word and see if
the word is one of the words of an array of strings and then increment
an index with the size of the word to parse the rest of the text
Sounds like you rather want String#scan.
It is working good but when I try it with unicode characters, I obtain
the letters of the first word and not the hole first word:
str[/[\u0627-\u064A]+/,1]
Maybe your range is missing something. I'd rather use specific
character classes for this anyway:
str.scan /\p{Word}+/ do |word|
printf "Found word: %p\n", word
end
http://www.geocities.jp/kosako3/oniguruma/doc/RE.txt
Kind regards
robert
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On Mon, Nov 21, 2011 at 11:55 PM, rubix Rubix <aggouni2002@yahoo.fr> wrote:
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/