subject:"\[go\-nuts\] string matching"

Re: [go-nuts] string matching

2021-04-02 Thread 'wagner riffel' via golang-nuts

On Thu Apr 1, 2021 at 4:45 PM -03, Sharan Guhan wrote:
> r := regexp.MustCompile(`Core Count: [0-9]+`)
> match := r.FindAllStringSubmatch(cmd_output, -1)

As of the "efficiently" part, you should compile the regexp once
instead of each call to ParseFillCpuInfo, a common practice is to use
a package-level scoped variable but even better (for efficiency) would
be keep it with strings.Index approach, as such:

count := -1
const substr = "Core Count: "
if i := strings.Index(input, substr); i >= 0 {
countStart := i + len(substr)

const digits = "0123456789"
j := 0
for strings.ContainsRune(digits, rune(input[countStart+j])) {
j++
}
count, err := strconv.Atoi(input[countStart : countStart+j])
// handle err
}

You can benchmark both approaches using testing.B, have fun.

https://golang.org/pkg/testing/#B

-- 
You received this message because you are subscribed to the Google Groups 
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/golang-nuts/CACXYA0GSJR6.UVYEID10NHU0%40pampas.

Re: [go-nuts] string matching

2021-04-01 Thread Sharan Guhan

Thanks Everyone for such good responses and for code pointers !!!
It really helped me.. I have a long string with multiple such
occurrences and I need to keep filling them into an array.. I consolidated
all of your approaches and now have a working model as below..


func ParseandFillCpuInfo (cmd_output string) {
var per_cpu Cpus

r := regexp.MustCompile(`Core Count: [0-9]+`)
match := r.FindAllStringSubmatch(cmd_output, -1)

for i:=0; i wrote:

> You were on a good start with strings.Index().  The key is to move
> past the pattern you searched for, assuming it was found.
>
> Something like this should work, if `bigString` is what you are
> searching over, and depending on whether "Core Count:" might be on the
> first line or not:
>
> pattern := "\nCore Count: "
> if start := strings.Index(bigString, pattern); start >= 0 {
> var nCores int
> _, err := fmt.Sscanf(bigString[start+len(pattern):], "%d", )
> if err == nil {
> fmt.Println("Number of cores:", nCores)
> }
> }
>
> As you can see, the regular expression-based solution suggested by
> others leads to less code.  This input string is so short that CPU
> usage will be negligible for most purposes, outweighed by graceful
> error handling and code maintenance concerns.
>
> Best regards,
> Michael
>
>
> On Thu, Apr 1, 2021 at 2:28 PM Sharan Guhan  wrote:
> >
> > Hi Experts,
> >
> > New to Golang and finding it non trivial to achieve the below
> efficiently :-) Any pointers will help..
> >
> > I have a huge string as below  .. Now from this I want to extract the
> number "18" after "Core count".. I was thinking of walking through each
> string with Spilt("\n"), but that will make it slower. I also tried
> strings.Index with "Core count", but unable to see how to pull the 18 from
> this..
> >
> > Sharan
> >
> >
> > "Version: Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz
> > Voltage: 1.6 V
> > External Clock: 100 MHz
> > Max Speed: 4000 MHz
> > Current Speed: 2300 MHz
> > Status: Populated, Enabled
> > Upgrade: Socket LGA3647-1
> > L1 Cache Handle: 0x004D
> > L2 Cache Handle: 0x004E
> > L3 Cache Handle: 0x004F
> > Serial Number: Not Specified
> > Asset Tag: UNKNOWN
> > Part Number: Not Specified
> > Core Count: 18"
> >
> > --
> > You received this message because you are subscribed to the Google
> Groups "golang-nuts" group.
> > To unsubscribe from this group and stop receiving emails from it, send
> an email to golang-nuts+unsubscr...@googlegroups.com.
> > To view this discussion on the web visit
> https://groups.google.com/d/msgid/golang-nuts/CAGOT8aq8btVfAYWCpGz69cvPG_OQomNGyUjBg7oa85%2BAKqp7yQ%40mail.gmail.com
> .
>

-- 
You received this message because you are subscribed to the Google Groups 
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/golang-nuts/CAGOT8apd-Pp7G0hHUhoAs-XRkh%2BJgLn4Gm7NTh7w4HxLPEtDXQ%40mail.gmail.com.

Re: [go-nuts] string matching

2021-04-01 Thread Michael Poole

You were on a good start with strings.Index().  The key is to move
past the pattern you searched for, assuming it was found.

Something like this should work, if `bigString` is what you are
searching over, and depending on whether "Core Count:" might be on the
first line or not:

pattern := "\nCore Count: "
if start := strings.Index(bigString, pattern); start >= 0 {
var nCores int
_, err := fmt.Sscanf(bigString[start+len(pattern):], "%d", )
if err == nil {
fmt.Println("Number of cores:", nCores)
}
}

As you can see, the regular expression-based solution suggested by
others leads to less code.  This input string is so short that CPU
usage will be negligible for most purposes, outweighed by graceful
error handling and code maintenance concerns.

Best regards,
Michael


On Thu, Apr 1, 2021 at 2:28 PM Sharan Guhan  wrote:
>
> Hi Experts,
>
> New to Golang and finding it non trivial to achieve the below efficiently :-) 
> Any pointers will help..
>
> I have a huge string as below  .. Now from this I want to extract the number 
> "18" after "Core count".. I was thinking of walking through each string with 
> Spilt("\n"), but that will make it slower. I also tried strings.Index with 
> "Core count", but unable to see how to pull the 18 from this..
>
> Sharan
>
>
> "Version: Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz
> Voltage: 1.6 V
> External Clock: 100 MHz
> Max Speed: 4000 MHz
> Current Speed: 2300 MHz
> Status: Populated, Enabled
> Upgrade: Socket LGA3647-1
> L1 Cache Handle: 0x004D
> L2 Cache Handle: 0x004E
> L3 Cache Handle: 0x004F
> Serial Number: Not Specified
> Asset Tag: UNKNOWN
> Part Number: Not Specified
> Core Count: 18"
>
> --
> You received this message because you are subscribed to the Google Groups 
> "golang-nuts" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to golang-nuts+unsubscr...@googlegroups.com.
> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/golang-nuts/CAGOT8aq8btVfAYWCpGz69cvPG_OQomNGyUjBg7oa85%2BAKqp7yQ%40mail.gmail.com.

-- 
You received this message because you are subscribed to the Google Groups 
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/golang-nuts/CAOU-OAL3_OQyVz_Zu9wntCLoKTiMeD-QazaOnZ_287_JdyQvrg%40mail.gmail.com.

Re: [go-nuts] string matching

2021-04-01 Thread Amnon

Or you could try something like https://play.golang.org/p/xkmchEgyVir

On Thursday, 1 April 2021 at 20:02:29 UTC+1 Matt KØDVB wrote:

> Use a capture group
>
> regex := regexp.MustCompile(`.*\bCore Count: (\d+)`)
> result := regex.FindAllStringSubmatch(raw, -1) 
>
> https://play.golang.org/p/r_TxhVZVfzE
>
> See also https://www.youtube.com/watch?v=XCE0psygwj8
>
> On Apr 1, 2021, at 12:32 PM, Artur Vianna  wrote:
>
> Try the regex: "Core Count: [0-9]+", then split on ":" and select the 
> second part.
>
> On Thu, 1 Apr 2021, 15:28 Sharan Guhan,  wrote:
>
>> Hi Experts,
>>
>> New to Golang and finding it non trivial to achieve the below efficiently 
>> :-) Any pointers will help..
>>
>> I have a huge string as below  .. Now from this I want to extract the 
>> number "18" after "Core count".. I was thinking of walking through each 
>> string with Spilt("\n"), but that will make it slower. I also tried 
>> strings.Index with "Core count", but unable to see how to pull the 18 from 
>> this..
>>
>> Sharan
>>
>>
>> "Version: Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz
>> Voltage: 1.6 V
>> External Clock: 100 MHz
>> Max Speed: 4000 MHz
>> Current Speed: 2300 MHz
>> Status: Populated, Enabled
>> Upgrade: Socket LGA3647-1
>> L1 Cache Handle: 0x004D
>> L2 Cache Handle: 0x004E
>> L3 Cache Handle: 0x004F
>> Serial Number: Not Specified
>> Asset Tag: UNKNOWN
>> Part Number: Not Specified
>> Core Count: 18"
>>
>> -- 
>> You received this message because you are subscribed to the Google Groups 
>> "golang-nuts" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to golang-nuts...@googlegroups.com.
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/golang-nuts/CAGOT8aq8btVfAYWCpGz69cvPG_OQomNGyUjBg7oa85%2BAKqp7yQ%40mail.gmail.com
>>  
>> 
>> .
>>
>
> -- 
> You received this message because you are subscribed to the Google Groups 
> "golang-nuts" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to golang-nuts...@googlegroups.com.
>
> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/golang-nuts/CAE%3DAWBUkNucnBM762j-3fPu%2BD8wEMbo4xe%2B4QxM40oosiqCq7w%40mail.gmail.com
>  
> 
> .
>
>
>

-- 
You received this message because you are subscribed to the Google Groups 
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/golang-nuts/430a46db-cf72-4caf-8d40-93f71f397b0bn%40googlegroups.com.

Re: [go-nuts] string matching

2021-04-01 Thread Matt KØDVB

Use a capture group

regex := regexp.MustCompile(`.*\bCore Count: (\d+)`)
result := regex.FindAllStringSubmatch(raw, -1) 

https://play.golang.org/p/r_TxhVZVfzE 

See also https://www.youtube.com/watch?v=XCE0psygwj8

> On Apr 1, 2021, at 12:32 PM, Artur Vianna  wrote:
> 
> Try the regex: "Core Count: [0-9]+", then split on ":" and select the second 
> part.
> 
> On Thu, 1 Apr 2021, 15:28 Sharan Guhan,  > wrote:
> Hi Experts,
> 
> New to Golang and finding it non trivial to achieve the below efficiently :-) 
> Any pointers will help..
> 
> I have a huge string as below  .. Now from this I want to extract the number 
> "18" after "Core count".. I was thinking of walking through each string with 
> Spilt("\n"), but that will make it slower. I also tried strings.Index with 
> "Core count", but unable to see how to pull the 18 from this..
> 
> Sharan
> 
> 
> "Version: Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz
> Voltage: 1.6 V
> External Clock: 100 MHz
> Max Speed: 4000 MHz
> Current Speed: 2300 MHz
> Status: Populated, Enabled
> Upgrade: Socket LGA3647-1
> L1 Cache Handle: 0x004D
> L2 Cache Handle: 0x004E
> L3 Cache Handle: 0x004F
> Serial Number: Not Specified
> Asset Tag: UNKNOWN
> Part Number: Not Specified
> Core Count: 18"
> 
> -- 
> You received this message because you are subscribed to the Google Groups 
> "golang-nuts" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to golang-nuts+unsubscr...@googlegroups.com 
> .
> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/golang-nuts/CAGOT8aq8btVfAYWCpGz69cvPG_OQomNGyUjBg7oa85%2BAKqp7yQ%40mail.gmail.com
>  
> .
> 
> -- 
> You received this message because you are subscribed to the Google Groups 
> "golang-nuts" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to golang-nuts+unsubscr...@googlegroups.com 
> .
> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/golang-nuts/CAE%3DAWBUkNucnBM762j-3fPu%2BD8wEMbo4xe%2B4QxM40oosiqCq7w%40mail.gmail.com
>  
> .

-- 
You received this message because you are subscribed to the Google Groups 
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/golang-nuts/43FB3428-4EAE-4324-A10E-C76EB38C160A%40k0dvb.com.

Re: [go-nuts] string matching

2021-04-01 Thread Artur Vianna

Try the regex: "Core Count: [0-9]+", then split on ":" and select the
second part.

On Thu, 1 Apr 2021, 15:28 Sharan Guhan,  wrote:

> Hi Experts,
>
> New to Golang and finding it non trivial to achieve the below efficiently
> :-) Any pointers will help..
>
> I have a huge string as below  .. Now from this I want to extract the
> number "18" after "Core count".. I was thinking of walking through each
> string with Spilt("\n"), but that will make it slower. I also tried
> strings.Index with "Core count", but unable to see how to pull the 18 from
> this..
>
> Sharan
>
>
> "Version: Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz
> Voltage: 1.6 V
> External Clock: 100 MHz
> Max Speed: 4000 MHz
> Current Speed: 2300 MHz
> Status: Populated, Enabled
> Upgrade: Socket LGA3647-1
> L1 Cache Handle: 0x004D
> L2 Cache Handle: 0x004E
> L3 Cache Handle: 0x004F
> Serial Number: Not Specified
> Asset Tag: UNKNOWN
> Part Number: Not Specified
> Core Count: 18"
>
> --
> You received this message because you are subscribed to the Google Groups
> "golang-nuts" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to golang-nuts+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/golang-nuts/CAGOT8aq8btVfAYWCpGz69cvPG_OQomNGyUjBg7oa85%2BAKqp7yQ%40mail.gmail.com
> 
> .
>

-- 
You received this message because you are subscribed to the Google Groups 
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/golang-nuts/CAE%3DAWBUkNucnBM762j-3fPu%2BD8wEMbo4xe%2B4QxM40oosiqCq7w%40mail.gmail.com.

[go-nuts] string matching

2021-04-01 Thread Sharan Guhan

Hi Experts,

New to Golang and finding it non trivial to achieve the below efficiently
:-) Any pointers will help..

I have a huge string as below  .. Now from this I want to extract the
number "18" after "Core count".. I was thinking of walking through each
string with Spilt("\n"), but that will make it slower. I also tried
strings.Index with "Core count", but unable to see how to pull the 18 from
this..

Sharan


"Version: Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz
Voltage: 1.6 V
External Clock: 100 MHz
Max Speed: 4000 MHz
Current Speed: 2300 MHz
Status: Populated, Enabled
Upgrade: Socket LGA3647-1
L1 Cache Handle: 0x004D
L2 Cache Handle: 0x004E
L3 Cache Handle: 0x004F
Serial Number: Not Specified
Asset Tag: UNKNOWN
Part Number: Not Specified
Core Count: 18"

-- 
You received this message because you are subscribed to the Google Groups 
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/golang-nuts/CAGOT8aq8btVfAYWCpGz69cvPG_OQomNGyUjBg7oa85%2BAKqp7yQ%40mail.gmail.com.

Re: [go-nuts] string matching

Re: [go-nuts] string matching

Re: [go-nuts] string matching

Re: [go-nuts] string matching

Re: [go-nuts] string matching

Re: [go-nuts] string matching

[go-nuts] string matching

7 matches

Site Navigation

Mail list logo

Footer information