Regular Expressions 101

1st Alternative^\h+

^start of line

\h+any horizontal whitespace character, repeated at least once

2nd Alternative\h+$

\h+any horizontal whitespace character, repeated at least once

$end of line

3rd Alternative(\R){2,}

Group 1(\R){2,}

{2,}repeats the group contents below at least 2 times:

\Ra newline sequence

4th Alternative(\s){2,}

Group 2(\s){2,}

{2,}repeats the group contents below at least 2 times:

\sany whitespace character

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^\h+|\h+$|(\R){2,}|(\s){2,}

New

 1 . BritishAirways 15FEB LONDON HONGKONG


     2 . CathayPacific  01MAR     HONGKONG   SHANGHAI



  3 . Qantas   12MAR SINGAPORE SYDNEY

$1$2