Retrivieng specific occurrences of a given Regex with Oracle SQL -

-

in simplified form, i'm attempting retrieve either first occurrence of '.*?=(.*?);.*' regex, or second, or third -- is, either x or y or z (that is, want able hardcode in query want first, second or third values) in following example:

select regexp_replace(   'margin=x;margin=y;margin=z;',   '.*?=(.*?);.*',   '\1',   1 -- occurrences. thought picking 1, 2 or 3 solve problem? ) dual;  -- returns "xyz", terrible. expecting return "x", in case.

looking @ oracle documentation, thought relatively straightforward, last parameter (occurrences), apparently allows me select groups take consideration. doesn't! why?

thanks

i´m goingoff completly different solution. combining hierarchial substring select regexp_replace option needs?

this way create option either select 1 or multiple values, depending on needs. wouldn´t need write concatinating regex value , adjust select bit more needs

select regexp_replace(subselect.val, '.*=(.*?);', '\1') -- remove "margin=" (select regexp_substr(              'margin=x;margin=y;margin=z;',              '.*?=(.*?);',              1,              level) val,              level lvl       dual       connect regexp_substr('margin=x;margin=y;margin=z;',                               '.*?=(.*?);',                               1,                               level) not null) subselect -- select represents each margin=t single row lvl = 1; -- cou define multiple values select aswell.

Comments

Post a Comment

Popular posts from this blog

Spring Boot + JPA + Hibernate: Unable to locate persister -

-
i trying work entity inside request method of spring boot application. entity in project , pom.xml has dependencies it. why error message?: org.hibernate.unknownentitytypeexception: unable locate persister: com.ric.bill.model.bs.par package com.ric.web; import java.util.concurrent.atomic.atomiclong; import javax.persistence.entitymanager; import javax.persistence.persistencecontext; import net.sf.ehcache.cachemanager; import net.sf.ehcache.management.cache; import net.sf.ehcache.management.cachestatistics; import org.hibernate.stat.statistics; import org.springframework.beans.factory.annotation.autowired; import org.springframework.boot.autoconfigure.domain.entityscan; import org.springframework.cache.annotation.enablecaching; import org.springframework.transaction.annotation.enabletransactionmanagement; import org.springframework.transaction.annotation.propagation; import org.springframework.transaction.annotation.transactional; import org.springframework.web.bind.annotati
Read more

go - Golang: panic: runtime error: invalid memory address or nil pointer dereference using bufio.Scanner -

-
i implementing go program uses bufio.scanner , bufio.writer have packaged code follows package main import ( "fmt" "player/command" "strings" ) func main() { //enter code here. read input stdin. print output stdout commands.scanner.scan() { //scan new line , send comand variable check command exist or not input := strings.split(strings.trim(commands.scanner.text(), " "), " ") command := input[0] if command == "" { fmt.printf("$ %s:", commands.pwd) continue } if !commands.commands[command] { commands.throwerror("cannot recognize input.") } else { commands.execute(command, input[1:], nil) } fmt.printf("$ %s:", commands.pwd) } } i using init.go file in main package follows package main import ( "flag" "player/sourc
Read more

c - double free or corruption (fasttop) -

-
this code reads null terminated string file (file containing null terminated strings & should provide index wanted string). error: *** error in `./main': double free or corruption (fasttop): 0x090a4a80 *** aborted code: char *tmp_realloc=null; char *sstring=null; int i=1; /*set file pointer point string*/ fseek(fh,index,seek_set); sstring=(char*)malloc(sizeof(char)); if(sstring == null) return null; tmp_realloc=sstring; while( (*(sstring+i-1)=(char)fgetc((file*)fh)) != 0x0 ) { /*reallocate more memory*/ tmp_realloc=(char*)realloc((char*)sstring,++i); /*if not same address copy old new & set old point new*/ if(tmp_realloc != sstring){ strcpy((char*)tmp_realloc,(char*)sstring); free(sstring); sstring=tmp_realloc; } } could tell me pointer causing issue (& reason) ? remove part /*if not same address copy old new & set old point new*/ if(tmp_realloc != sstring){ strc
Read more