Regular Expressions 101

Group with flags g(?-xism:\b(print|time)\b)

x modifier: -extended. Whitespace and # are treated as ordinary pattern characters

i modifier: -insensitive. Case-sensitive match

s modifier: -single line. A dot does not match line terminators

m modifier: -multiline. Makes ^ and $ use string boundaries instead of line boundaries

\ban ASCII word boundary

Group 1(print|time)

1st Alternativeprint

printthe literal text print (case sensitive)

2nd Alternativetime

timethe literal text time (case sensitive)

\ban ASCII word boundary

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?-xism:\b(print|time)\b)

New

print $time . "\n";
$epoc = time();