subject:"Re\: Need regex \^\? help"

Re: Need regex ^? help

2024-05-06 Thread ToddAndMargo via perl6-users


This is what I have so far.

my $x="  1.2.3.4:12345   "; $x = $x.trim; $x~~s/(.*'.') 
.*/$0$(Q[0/24])/; say "<$x>";

<1.2.3.0/24>

It works. Is there a way to petty it up with ^ and $   ?

Re: Need regex ^? help

2024-04-29 Thread ToddAndMargo via perl6-users


On 4/29/24 17:57, Patrick R. Michaud wrote:

Perhaps not really what you're intending, but here's how I'd start:

 $ raku -e 'my $x="1.2.3.4"; $x ~~ s!\d+$!0/24!; say $x;'
 1.2.3.0/24

The pattern part of the substitution matches all of the digits at the end of the string 
(\d+$), then replaces them with the string "0/24".  Everything prior to those 
digits is left alone.

On Mon, Apr 29, 2024 at 05:45:49PM -0700, ToddAndMargo via perl6-users wrote:

On 4/29/24 17:42, ToddAndMargo via perl6-users wrote:

Hi All,

I thought I understood ^ and ? used in a regex'es,
but I don't.

^ means from the beginning and ? from the end.


I think you mean "$" here instead of "?".

Pm



Oh I did figure it out another way.  I am trying to
get a working example of ^ and $ for my Redex
keeper file

Re: Need regex ^? help

2024-04-29 Thread Patrick R. Michaud

Perhaps not really what you're intending, but here's how I'd start:

$ raku -e 'my $x="1.2.3.4"; $x ~~ s!\d+$!0/24!; say $x;'
1.2.3.0/24

The pattern part of the substitution matches all of the digits at the end of 
the string (\d+$), then replaces them with the string "0/24".  Everything prior 
to those digits is left alone.

On Mon, Apr 29, 2024 at 05:45:49PM -0700, ToddAndMargo via perl6-users wrote:
> On 4/29/24 17:42, ToddAndMargo via perl6-users wrote:
> > Hi All,
> > 
> > I thought I understood ^ and ? used in a regex'es,
> > but I don't.
> > 
> > ^ means from the beginning and ? from the end.

I think you mean "$" here instead of "?".

Pm

Re: Need regex ^? help

2024-04-29 Thread ToddAndMargo via perl6-users


On 4/29/24 17:42, ToddAndMargo via perl6-users wrote:

Hi All,

I thought I understood ^ and ? used in a regex'es,
but I don't.

^ means from the beginning and ? from the end.

I am trying to put together an example
of how to use them:

I have

    1.2.3.4

I want
    1.2.3.0/24

So Far I have (not working):

    raku -e 'my $x="1.2.3.4"; $x~~s/ (.*) $(Q[.]) /$0Q[0/24]/; say $x;'

How do I do this with ^ and $  ?

Many thanks,
-T



raku -e 'my $x="1.2.3.4"; $x~~s/ (.*) $(Q[.]) /$0$(Q[0.24])/; say $x;'
1.2.30.244

Re: Need regex help

2018-09-16 Thread ToddAndMargo

On 09/15/2018 07:32 PM, Larry Wall wrote:

On Sat, Sep 15, 2018 at 06:45:33PM -0700, ToddAndMargo wrote:
: Hi All,
:
: I have been doing a bunch with regex's lately.
: I just throw them out based on prior experience
: and they most all work now. I only sometimes have to
: ask for help. (The look forward () feature
: is sweet.)
:
: Anyway, I have been using regex switches without
: knowing why. So
:
: What is the difference between
:
: \N

That is a character that is not any of the valid \n characters.

: :\N

That is not a thing. That is a colon, which causes the previous thing
to not backtrack (if it would), followed by a \N (see above).

: <:\N>

That is not a thing. In fact, it's a syntax error.

: <<\:N>>

That also is not a thing. That is a left word boundary <<, followed by
\:, which matches a quote literally because it's backslashed, followed
by an N, which also matches literally, followed by the right word
boundary >>. As a pattern, it is impossible for the combination to match,
since, while >> can match after a literal N, a << cannot match before a colon.

: And why would I choose one over the other (what
: are they called out for)?

I would never choose any of them, apart from \N. Where are you getting
this craptastic list from?

Larry

Hi Larry,

Well. I will have to go through my question with a fine
toothed comb and create a keeper tutorial for what I
come up with. And in the process, I will no doubt trip
across a lot of stuff I got wrong.

It may be two weeks before I get back -- I have to finish
my company's federal taxes -- but I will get back with whagt I
come up with.

And to answer your question: I got some of this stuff
from

https://docs.perl6.org/language/regexes#index-entry-regex_%3C%3Aproperty%3E-Unicode_properties

some from context (what I have seen), and

Well, the rest of it from, shall we say pulled out of
my ear.

Into everyone's life a little humiliation must fall.

Thank you for all your help with this.

-T

Re: Need regex help

2018-09-15 Thread Larry Wall

On Sat, Sep 15, 2018 at 06:45:33PM -0700, ToddAndMargo wrote:
: Hi All,
: 
: I have been doing a bunch with regex's lately.
: I just throw them out based on prior experience
: and they most all work now.  I only sometimes have to
: ask for help.  (The look forward () feature
: is sweet.)
: 
: Anyway, I have been using regex switches without
: knowing why. So
: 
: What is the difference between
: 
: \N

That is a character that is not any of the valid \n characters.

: :\N

That is not a thing.  That is a colon, which causes the previous thing
to not backtrack (if it would), followed by a \N (see above).

: <:\N>

That is not a thing.  In fact, it's a syntax error.

: <<\:N>>

That also is not a thing.  That is a left word boundary <<, followed by
\:, which matches a quote literally because it's backslashed, followed
by an N, which also matches literally, followed by the right word
boundary >>.  As a pattern, it is impossible for the combination to match,
since, while >> can match after a literal N, a << cannot match before a colon.

: And why would I choose one over the other (what
: are they called out for)?

I would never choose any of them, apart from \N.  Where are you getting
this craptastic list from?

Larry

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