CHALLENGE

ACTIVITY

$8\mathrm{.}1\mathrm{.}1$: Regular expressions.

$518868\mathrm{.}2120922.$qx$3$zqy$7$

Assign re with a regular expression that contains a lower$-$case letter $($a$-$z$).$

$1$ let re $/*$ Your solution goes here $*/$ ;

$2$

${}_4$

$1$

$2$

$3$

$4$