String replacement

ruby-talk
1

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

tfyh

joss

2

Alle venerdì 27 aprile 2007, Josselin ha scritto:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't
see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

tfyh

joss

If the text you need to replace is always at the end of the string, you can
do:

str.sub /\d+$/, '9999'

This will replace the text matching the regexp (i.e, one or more digit
followed by the end of the line) with the given string (note that this won't
change the original string, but return a new one. If you need to change the
original one, use sub! instead of sub).

I hope this helps

Stefano

3

Josselin wrote:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

tfyh

joss

str.gsub!(/31551/, "9999")

good luck,
dan

4

str[/\d+/] = "9999"

···

On Apr 27, 2:29 am, Josselin <josse...@wanadoo.fr> wrote:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't
see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

tfyh

joss

5

How about

irb(main):006:0> str = "/proposal/list/31551"
=> "/proposal/list/31551"
irb(main):007:0> str[%r{\d+$}]="9999"
=> "9999"
irb(main):008:0> str
=> "/proposal/list/9999"

If it's a file name you could also do

irb(main):012:0> File.join(File.dirname(str), "9999")
=> "/proposal/list/9999"

I estimate there are another 5 million other ways around. :slight_smile:

Kind regards

  robert

···

On 27.04.2007 09:29, Josselin wrote:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

6

thanks Björn , expected result for digits, but I forgot any other characters , replacing the item after the last / was my goal

irb(main):007:0> str = "/proposals/list/31555"
=> "/proposals/list/31555"
irb(main):012:0> str.gsub! /[0-9]+$/, "9999"
=> "/proposals/list/9999"

but

irb(main):013:0> str2 = "/proposals/list/abcde"
=> "/proposals/list/abcde"
irb(main):014:0> str2.gsub! /[0-9]+$/, "9999"
=> nil

josss :-))

···

On 2007-04-27 09:37:25 +0200, Björn Paetzel <news@kolrabi.de> said:

Josselin schrieb:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't see whicj method I should use ?

How about:

str.gsub! "31551", "9999"

or to replace "the number at the end":

str.gsub! /[0-9]+$/, "9999"

:slight_smile:

7

William James wrote:

···

On Apr 27, 2:29 am, Josselin <josse...@wanadoo.fr> wrote:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't
see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

tfyh

joss

str[/\d+/] = "9999"

Whoa. I hadn't seen that syntax before. Nice.

--
Alex

8

Thnaks Stefano , it gives the expected result

irb(main):007:0> str = "/proposals/list/31555"
=> "/proposals/list/31555"
irb(main):008:0> str.sub /\d+$/, '9999'
=> "/proposals/list/9999"

;-)))

···

On 2007-04-27 09:36:31 +0200, Stefano Crocco <stefano.crocco@alice.it> said:

Alle venerdì 27 aprile 2007, Josselin ha scritto:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't
see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

tfyh

joss

If the text you need to replace is always at the end of the string, you can

do:

str.sub /\d+$/, '9999'

This will replace the text matching the regexp (i.e, one or more digit
followed by the end of the line) with the given string (note that this won'
t
change the original string, but return a new one. If you need to change the

original one, use sub! instead of sub).

I hope this helps

Stefano

9

thanks Dan, but I looked for more generic replacement.. as Stefano mentionned

joss

···

On 2007-04-27 09:39:04 +0200, Dan Zwell <dzwell@gmail.com> said:

Josselin wrote:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

tfyh

joss

str.gsub!(/31551/, "9999")

good luck,
dan

10

irb(main):007:0> str = "/proposals/list/31555"
=> "/proposals/list/31555"
irb(main):008:0> str.sub /\d+$/, '9999'
=> "/proposals/list/9999"
irb(main):009:0> str[/\d+/] = "9999"
=> "9999"

got it from Stefano... Thanks Bill

···

On 2007-04-27 09:52:29 +0200, William James <w_a_x_man@yahoo.com> said:

On Apr 27, 2:29 am, Josselin <josse...@wanadoo.fr> wrote:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't
see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

tfyh

joss

str[/\d+/] = "9999"

11

I forgot to mention my main objective > replacing the term after the last '/'..
thanks to all

Joss

···

On 2007-04-27 11:15:15 +0200, Robert Klemme <shortcutter@googlemail.com> said:

On 27.04.2007 09:29, Josselin wrote:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

How about

irb(main):006:0> str = "/proposal/list/31551"
=> "/proposal/list/31551"
irb(main):007:0> str[%r{\d+$}]="9999"
=> "9999"
irb(main):008:0> str
=> "/proposal/list/9999"

If it's a file name you could also do

irb(main):012:0> File.join(File.dirname(str), "9999")
=> "/proposal/list/9999"

I estimate there are another 5 million other ways around. :slight_smile:

Kind regards

  robert

12

<snip>

thanks Björn , expected result for digits, but I forgot any other
characters , replacing the item after the last / was my goal

Ah that gives the problem a different flavor:

(str.split("/")[0..-2] + ["9999"]).join("/")

but regexens are probably better after all

str.sub!(%r{[^/]*$}, "9999")

HTH
Robert

···

On 4/27/07, Josselin <josselin@wanadoo.fr> wrote:

irb(main):007:0> str = "/proposals/list/31555"
=> "/proposals/list/31555"
irb(main):012:0> str.gsub! /[0-9]+$/, "9999"
=> "/proposals/list/9999"

but

irb(main):013:0> str2 = "/proposals/list/abcde"
=> "/proposals/list/abcde"
irb(main):014:0> str2.gsub! /[0-9]+$/, "9999"
=> nil

josss :-))

--
You see things; and you say Why?
But I dream things that never were; and I say Why not?
-- George Bernard Shaw

13

irb(main):007:0> str = "/proposals/list/31555"
=> "/proposals/list/31555"
irb(main):008:0> str.sub /\d+$/, '9999'
=> "/proposals/list/9999"
irb(main):009:0> str[/\d+/] = "9999"
=> "9999"

don't give the expected result... Stefano's way did it .... ;-))

thanks Alex

···

On 2007-04-27 10:01:07 +0200, Alex Young <alex@blackkettle.org> said:

William James wrote:

On Apr 27, 2:29 am, Josselin <josse...@wanadoo.fr> wrote:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't
see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

tfyh

joss

str[/\d+/] = "9999"

Whoa. I hadn't seen that syntax before. Nice.

14

In that case I'd use the File approach or do str[%r{[^/]+$}]="9999"

  robert

···

On 27.04.2007 15:18, Josselin wrote:

On 2007-04-27 11:15:15 +0200, Robert Klemme <shortcutter@googlemail.com> > said:

On 27.04.2007 09:29, Josselin wrote:

I have a string : str = "/proposal/list/31551"

I would like to change the 31551 by another value "9999", but I don't see whicj method I should use ?

str.each and block ? or str.rindex('/') and concatenating the new value ?

How about

irb(main):006:0> str = "/proposal/list/31551"
=> "/proposal/list/31551"
irb(main):007:0> str[%r{\d+$}]="9999"
=> "9999"
irb(main):008:0> str
=> "/proposal/list/9999"

If it's a file name you could also do

irb(main):012:0> File.join(File.dirname(str), "9999")
=> "/proposal/list/9999"

I estimate there are another 5 million other ways around. :slight_smile:

Kind regards

    robert

I forgot to mention my main objective > replacing the term after the last '/'..
thanks to all

15

Josselin wrote:

irb(main):009:0> str[/\d+/] = "9999"
=> "9999"

The return value of the assignment is "9999", but the value of str will be the
whole string with the 9999 at the end, so exactly what you wanted.

···

--
Ist so, weil ist so
Bleibt so, weil war so