Fix sed command line in "Diagnostics - Flame Graphs" guide #4636
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This pr fixes the sed command line used for perf file cleanup by enabling Extended Regular Expressions (ERE) syntax, so that the first sed script (that deletes lines containing "
__libc_start
", "LazyCompile
" etc.) works. The alternative to enabling ERE syntax is to escape(
,|
,)
and?
which is less elegant.