Match regex from right to left?

Question

Is there any way of matching a regex from right to left? What Im looking for is a regex that gets

MODULE WAS INSERTED              EVENT
LOST SIGNAL ON E1/T         


        

Answer 1

With regex, you could simply replace this:

^.{56}|.{19}$

with the empty string.

But really, you only need to cut out the string from "position 56" to "string-length - 19" with a substring function. That's easier and much faster than regex.

Here's an example in JavaScript, other languages work more or less the same:

var lines = [
  'CLI MUX trap received: (022) CL-B  MCL-2ETH             MODULE WAS INSERTED              EVENT   07-05-2010 12:08:40',
  'CLI MUX trap received: (090) IO-2  ML-1E1        EX1    LOST SIGNAL ON E1/T1 LINK        OFF     04-06-2010 09:58:58',
  'CLI MUX trap received: (094) IO-2  ML-1E1        EX1    CRC ERROR                        EVENT   04-06-2010 09:58:59',
  'CLI MUX trap received: (009)                            CLK IS DIFF FROM MASTER CLK SRC  OFF     07-05-2010 12:07:32'
];
for (var i=0; i