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7eda849dce
We can now replace matching regex parts with a string, a la sed. Note that there are at least 3 different behaviours for existing sed implementations when matching 0-length strings. Here is the result of the following operation on each implementationt tested : echo 'xzxyz' | sed -e 's/x*y*/A/g' GNU sed 4.2.1 => AzAzA Perl's sed 5.16.1 => AAzAAzA Busybox v1.11.2 sed => AzAz The psed behaviour was adopted because it causes the least exceptions in the code and seems logical from a certain perspective : - "x" matches x*y* => add "A" and skip "x" - "z" matches x*y* => add "A" and keep "z", not part of the match - "xy" matches x*y* => add "A" and skip "xy" - "z" matches x*y* => add "A" and keep "z", not part of the match - "" matches x*y* => add "A" and stop here Anyway, given the incompatibilities between implementations, it's unlikely that some processing will rely on this behaviour. There currently is one big limitation : the configuration parser makes it impossible to pass commas or closing parenthesis (or even closing brackets in log formats). But that's still quite usable to replace certain characters or character sequences. It will become more complete once the config parser is reworked.