Here is an explanation made using

RegexBuddy - also check

www.regular-expressions.info for tutorials, references and more.

^(.{62}(.{7}).{139}) {10}
Assert position at the beginning of a line (at beginning of the string or after a line break character) «^»

Match the regular expression below and capture its match into backreference number 1 «(.{62}(.{7}).{139})»

--Match any single character that is not a line break character «.{62}»

----Exactly 62 times «{62}»

--Match the regular expression below and capture its match into backreference number 2 «(.{7})»

----Match any single character that is not a line break character «.{7}»

------Exactly 7 times «{7}»

--Match any single character that is not a line break character «.{139}»

----Exactly 139 times «{139}»

Match the space character « {10}»

--Exactly 10 times «{10}»

So you see 62 and 139 are number of columns to skip past to get to the "interesting" columns.