linux - How can I retrieve logs between two timeframes using regex? -

i have huge log file, each line log entry it's own timestamp. how can retrieve logs in-between 2 specified timestaps (ie. start time - 22:00:00, end time - 23:00:00)?

using bash, possible generate regex statement based on 2 input timestamps, may pipe command (such grep):

#!/bin/bash  #this bare-bone recursive script accepts input of start/end timeframe #in 24-hour format, based on regex statement generated  #select values in between 2 timeframes. please note script #has undergone optimization (i apologize reading difficulty, #did not occur me until might have use such script).  #you free use, distribute, or modify script heart's content. #constructive feedback welcome. did best eliminate bugs, should #you find case generated regex incorrect timestamps, please #let me know.  echo $0 - args passed: $1 $2  start_time=$(echo $1 | tr -d ":") end_time=$(echo $2 | tr -d ":") diff_char="" regex=""  function loop () {   diffcharvalue=$1   maxval=$2   while [ $diffcharvalue -lt $maxval ]       regex="${regex}:[0-5][0-9]"     let diffcharvalue+=2   done }  function regexgen () {   diffchar=$1   start=$2   end=$3   if [ $diffchar -le 6 ];     regexgen $(($diffchar + 1)) $start $end 0 #the fourth arg acts recursion indicaton, whether function called recursively or not     let diffchar-=1     diffcharminusone=$(($diffchar - 1))     startbegin=${start:0:$diffcharminusone}     endbegin=${end:0:$diffcharminusone}     startcut=${start:$diffcharminusone:1}     endcut=${end:$diffcharminusone:1}     endstartdiff=$(($endcut-$startcut))      if [ $(($diffchar % 2)) -eq 0 ];       if [ $4 -eq 0 ];         regex="${regex}$startbegin[$startcut-9]"         loop $diffchar 6         regex="${regex}|$endbegin[0-$endcut]"         loop $diffchar 6         regex="${regex}|"       elif [ $endstartdiff -gt 1 ];         if [ $endstartdiff -eq 2 ];           regex="${regex}$startbegin[$(($startcut+1))]"         else           regex="${regex}$startbegin[$(($startcut+1))-$(($endcut-1))]"         fi         loop $diffchar 6         echo $regex       else         echo ${regex%?}       fi     else       if [ $4 -eq 0 ];         if [ $startcut -lt 5 ];           regex="${regex}$startbegin[$startcut-5][0-9]"           loop $diffchar 5           regex="${regex}|"         fi         if [ $endcut -gt 0 ];           regex="${regex}$endbegin[0-$endcut][0-9]"           loop $diffchar 5           regex="${regex}|"         fi       elif [ $endstartdiff -gt 1 ];         if [ $diffcharminusone -gt 0 ];           regex="${regex}$startbegin"         fi         if [ $endstartdiff -eq 2 ];           regex="${regex}[$(($startcut+1))][0-9]"         else           regex="${regex}[$(($startcut+1))-$(($endcut-1))][0-9]"         fi         loop $diffchar 5         echo $regex       else         echo ${regex%?}       fi     fi   fi }  in {0..5}   if [ ${end_time:$a:1} -gt ${start_time:$a:1} ];then     diff_char=$(($a+1))     break   fi done  result=$(regexgen $diff_char $start_time $end_time 1 | sed 's/\([0-9][0-9]\)/\1:/g') echo $result