collecting substrings from the string

[krishna chaithanya]

Hi,

I have a string "aaa://abcxyz/xxxxx"

I have to get strings "aaa", "abcxyz" and "/xxxxx" from the string I have.

Can you please help me out with this?

Thanks and Regards,
krishna

[hugortega]

Hi,

Which language? ... Anyway, the best solution will be based on regular expressions, using parenthesis for memorize the part of the string. For example, in JS you can do:

var parts = /(\w+):\/\/(\w+)(\/\w+)/.exec(pattern)

and you will have an array with the parts of the expression... there are similar functionalities in almos all modern languages.

Hugo

[krishna chaithanya]

Hi,

The language is C. I tried the following and it is working.

string httpUrl("aaa://abcxyz/xxxxx");
string hostname;
char *local_path = NULL;
char *protocol = NULL;
char *ip = NULL;
protocol = strstr(httpUrl.c_str(), "//");
protocol++;
protocol++;
local_path = strstr(protocol, "/");
hostname = httpUrl.substr(protocol - httpUrl.c_str(),local_path - protocol);
printf("\nprotocol is %s and length is %d\n",protocol,strlen(protocol));
printf("\nlocal_path is %s and length is %d\n",local_path,strlen(local_path));
printf("\nhostname is %s and length is %d\n",hostname.c_str(),strlen(hostname.c_str()));

I just want to know if there is any better way to do this.

Thanks and Regards,
krishna

[ghostdog74]

Anyway, the best solution will be based on regular expressions

sometimes the best way is NOT to use regular expression

echo "aaa://abcxyz/xxxxx" | awk 'BEGIN{FS="://|/"}{print $1,$2,$3}'

[vonbiber]

Hi,

I have a string "aaa://abcxyz/xxxxx"

I have to get strings "aaa", "abcxyz" and "/xxxxx" from the string I have.

Can you please help me out with this?

Thanks and Regards,
krishna

you could use sed, eg

str="aaa://abcxyz/xxxxx"
str1=$(echo $str| sed's?^\([^:]*\):.*$?\1?')
str2=$(echo $str| sed 's?^[^/]*//\([^/]*\)/.*$?\1?')
str3=$(echo $str| sed 's?^[^/]*//[^/]*\(/.*\)$?\1?')

your first substring is stored in $str1, second substring in $str2, etc

[ghostdog74]

you could use sed, eg

str="aaa://abcxyz/xxxxx"
str1=$(echo $str| sed's?^\([^:]*\):.*$?\1?')
str2=$(echo $str| sed 's?^[^/]*//\([^/]*\)/.*$?\1?')
str3=$(echo $str| sed 's?^[^/]*//[^/]*\(/.*\)$?\1?')

your first substring is stored in $str1, second substring in $str2, etc

no need to call sed so many times,

# echo "aaa://abcxyz/xxxxx" | sed 's!\(.*\)://\(.*\)/\(.*\)!\1 \2 \3!'
aaa abcxyz xxxxx

in fact, if using bash, no need to call external commands

# string="aaa://abcxyz/xxxxx"
# IFS="/"
# set -- $string
# echo $1
aaa:
# echo $3
abcxyz
# echo $4
xxxxx