Character groups within sets in JavaScript regex

Character groups \d, \D, \w, \W, \s⁅/c ⁆, \S inside [] will denote groups, that is, they will still remain commands.



Example 

	In this example, the search pattern looks like 
	this: any digit or letter from 'a' 
	to 'f' is between x's:


	let str = 'xax xbx x1x x2x xhx x@x';
let res = str.replace(/x[\da-f]x/g, '!');


	As a result, the following will be 
	written to the variable:


	'! ! ! ! xhx x@x'


Example 

	In this example, the search pattern looks like 
	this: letter 'x', then a non-digit, 
	a non-dot, and not a small Latin letter, then 
	letter 'z':


	let str = 'xaz x1z xAz x.z x@z';
let res = str.replace(/x[^\d.a-z]z/g, '!');


	As a result, the following will be 
	written to the variable:


	'xaz x1z ! x.z !'


Practical tasks

	
		Write a regex that will find strings 
		according to the pattern: digit or 
		dot 1 or more times.
	


	
		Write a regex that finds strings according 
		to the pattern: a non-digit and non-letter 
		from 'a' to 'g' from 3 
		to 7 times.