Replacing lines matching a multi-line pattern (sed/perl/awk)
Dear Unix Forums,
I am hoping you can help me with a pattern matching problem.
What am I trying to do?
I want to replace multiple lines of a text file (that match a multi-line pattern) with a single line of text. These patterns can span several lines and do not always have the same number of line breaks in between.
One of the simpler patterns may look like this (pseudocode; meaning that only parts of the line are relevant and that the number of line breaks can vary):
Code:
^ * @CAL RtlInitAnsiString @PA1 0x0012f740 * ((1 to 3 line breaks)) * @CAL memmove @PA1 0x0012f740 * $
The matching text should be replaced with a string (e.g. "@MATCH").
In the end, the file should look like this:
Desired output
Code:
@MATCH //replaced lines 1 and 2
@MATCH //replaced lines 3 to 5, including the irrelevant BlaCall
@LIB ADVAPI32.dll @CAL RtlAnsiStringToUnicodeString @PA1 0x7ffdfbf8 @PA2 0x0012f740 @PA3 FALSE @RET STATUS_SUCCESS
Current solution for adjacent lines only:
Code:
sed 'N;s/\@LIB.*\@CAL RtlInitAnsiString .*\@PA1 0x0012f741.*\n.*\@CAL memmove \@PA1 0x0012f740.*/\@MATCH/' inputfile
Unfortunately, this does not seem to work for several line breaks (ie. when there is "gap" between the lines containing RtlInitAnsiString and memmove).
Experts,
I am a beginner to Unix Shell Scripting
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02-24-2014
