getify · July 20, 2022 19:31
diff --git a/1.js b/1.js
 var a = "j";                // "j"
 var b = "\\j";              // "\j"
 var c = "\\\\j";            // "\\j"
 var d = "\\\\\\j";          // "\\\j"
 var e = "\\\\\\\\j";        // "\\\\j"
 var f = "\\\\\\\\\\j";      // "\\\\\j"

 var just_j = nonescapedRE("j");
 just_j.test(a);              // true
 just_j.test(b);              // false
 just_j.test(c);              // true
 just_j.test(d);              // false
 just_j.test(e);              // true
 just_j.test(f);              // false

 var esc_j = escapedRE("j");
 esc_j.test(a);               // false
 esc_j.test(b);               // true
 esc_j.test(c);               // false
 esc_j.test(d);               // true
 esc_j.test(e);               // false
 esc_j.test(f);               // true
diff --git a/2.js b/2.js
 function nonescapedRE(match,flags) {
   return new RegExp(`(?<!\\\\)(\\\\\\\\)*${match}`,flags);
 }

 function escapedRE(match,flags) {
   return new RegExp(`(?<!\\\\)(\\\\)(\\\\\\\\)*${match}`,flags);
 }
	function nonescapedRE(match,flags) {
	return new RegExp(`(?<!\\\\)(\\\\\\\\)*${match}`,flags);
	}

	function escapedRE(match,flags) {
	return new RegExp(`(?<!\\\\)(\\\\)(\\\\\\\\)*${match}`,flags);
	}
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