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egrep string except when preceded by underscore

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# 1  
Old 09-30-2009
egrep string except when preceded by underscore
having trouble with this seemingly simple taks.. Smilie

Test data:

Quote:
${DB2HOME}/load_${Gmdsschema}.crnt_rgn_trunc_${SYS_FILE_DATE}
replace into ${Gmdsschema}.crnt_rgn
${Gmdsschema}.crnt_rgn
${DB2HOME}/load_${Gmdsschema}.crnt ${Gmdsschema}.base_rgn
we want to keep lines 2,3 & 4

-- want to exclude when ${.*schema} is preceded with an underscore; Valid {.*schema} should always be preceded spaces or be found at the beginning of a line.



Code:
 
egrep "[^_][$]{.*schema}\."

I would like to thank whomever looks at this in advance for your time .
# 2  
Old 09-30-2009
Code:
egrep '^\${[^}]*schema}|[^_]\${[^}]*schema}'

Last edited by Scrutinizer; 10-01-2009 at 06:57 PM..
# 3  
Old 10-01-2009
or :
Code:
egrep '(^|[^_])\${[^}]*schema}'

# 4  
Old 10-01-2009
Won't this not work for you?
Code:
fgrep '_${' file

# 5  
Old 10-02-2009
Quote:
Originally Posted by edidataguy
Won't this not work for you?
Code:
fgrep '_${' file

Hi editaguy, the OP was trying to match patterns without the preceding underscore. They should also be matched when at the beginning of a line.
# 6  
Old 10-03-2009
Quote:
Originally Posted by Scrutinizer
Hi editaguy, the OP was trying to match patterns without the preceding underscore. They should also be matched when at the beginning of a line.
Oooops....sorry some how I missed it.
Then will this work?
Code:
sed '/_\${.*schema}/ {/ \${.*schema}/!d;}' file

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