regex - Auto-clean Log Formats -

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i've run several different situations need implement "log cleanup" regex. i've had re-implement couple times, basic variant this:

the original

(23:59:59) username says: user inputted text (00:00:13) username user inputted action (00:01:42) username says: user inputted text (00:02:13) username says: user inputted text

i'm looking lookahead/lookbehind regex converts to:

(23:59:59) username says: user inputted text (00:00:13) username user inputted action  (00:01:42) username says: user inputted text (00:02:13) username says: user inputted text

what's angle of attack, , why?

unless regex absolutely necessary, 

awk '/^\(/{print ""}{printf "%s ",$0}' file

the logic behind print lines without newline, except when "(" encountered first character. can implemented in language.

bash

#!/bin/bash  while read -r line  case "$line" in    "("* ) echo  esac  printf "%s " $line done<"file"

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