JSFiddle - React, Tailwind, and code Playground

JavaScript

var inp = 17;
var rg = new RegExp("[^А-я]"+inp+"[^\d]", 'gi');
var tst = ["часть 179-а","часть 17-а","часть 17-2-б","часть 17б","час17 к","часть 17К"]
for (var i = 0; i<tst.length; i++) {
  if (rg.test(tst[i])) {
    console.log("Here"+(i+1));
  }
}