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#1
06-09-2006
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Regular Expressions
How can i create a regular expression which can detect a new line charcter followed by a special character say * and replace these both by a string of zero length?
Eg: Input File san.txt hello hi *User Good *Morning Good Bye Applying sed command sed 's/Reg.Expr/g' san.txt ---------------------------------------> Desired output hello hiUser GoodMorning Good Bye What should be the value of Reg.Expr i.e. Regular Expression to get the desired output?? Please help 
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#2
06-09-2006
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Code:
sed 's/^\*//s' filename
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#3
06-09-2006
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I tried that but it is not giving the desired output
$ sed 's/^\*//g' san.txt hello hi User Good Morning Good Bye Desired Output is hello hiUser GoodMorning Good Bye
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#4
06-09-2006
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I don't know how to do that with sed, I guess. awk works:
Code:
awk 'BEGIN{ getline; printf "%s", $0}
{ if(substr($0,1,1)=="*"){
printf "%s", substr($0,2)
}
else {
printf "\n%s", $0
}
}
END{printf "\n"}
' filename
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#5
06-09-2006
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Thank you so much...it worked for me.
I am a newbie to shell scripts and slowly working out my way. I have been trying this since two days but couldnt make out. Thanks again Last edited by sandeep_hi; 06-09-2006 at 05:44 AM.
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#7
06-11-2006
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Code:
BEGIN {lastString="";}
{ curStr=$0;
if (substr(curStr,1,1)=="*") {
len = length(lastString);
print substr(lastString,1,len) substr(curStr,2);
}else{
print substr(curStr,1)
}
lastString = curStr;
}
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