.*any Unicode character (except for line terminators), repeated any number of times
@amuthe literal text @amu (case sensitive) \.the literal . (4610 / 568 / 2E16)
eduthe literal text edu (case sensitive) \.the literal . (4610 / 568 / 2E16)
pl the literal text pl (case sensitive) \1the text saved by group 1
the literal (3210 / 408 / 2016)