diff --git a/dist/resolver/mem.js b/dist/resolver/mem.js
index 3f209de..fe7ea46 100644
--- a/dist/resolver/mem.js
+++ b/dist/resolver/mem.js
@@ -45,7 +45,7 @@ function buildPotentials(ps, popts, pathjoin) {
     let full = ps.full;
     let potentials = [];
     let implictExt = popts.implictExt || [];
-    let hasExt = full.match(implictExt.join('|') + '$');
+    let hasExt = implictExt.some(ext => full.endsWith(ext));
     // TODO: use Jsonic.util.escre
     if (!hasExt) {
         // Implicit extensions.
diff --git a/dist/resolver/mem.js.map b/dist/resolver/mem.js.map
index c856d7f..72e217f 100644
--- a/dist/resolver/mem.js.map
+++ b/dist/resolver/mem.js.map
@@ -1 +1 @@
-{"version":3,"file":"mem.js","sourceRoot":"","sources":["../../src/resolver/mem.ts"],"names":[],"mappings":";AAAA,gFAAgF;;AAMhF,0CAuCC;AAgBD,0CAmCC;AA7FD,gDAA0G;AAG1G,SAAgB,eAAe,CAAC,OAAuC;IAErE,OAAO,SAAS,WAAW,CACzB,IAAS,EACT,KAAyB,EACzB,KAAW,EACX,GAAY;QAEZ,sCAAsC;QAEtC,IAAI,EAAE,GAAG,IAAA,6BAAe,EAAC,KAAK,EAAE,GAAG,EAAE,IAAI,EAAE,iBAAiB,CAAC,OAAO,CAAC,CAAC,CAAA;QACtE,IAAI,GAAG,GAAG,SAAS,CAAA;QAEnB,IAAI,IAAI,IAAI,EAAE,CAAC,IAAI,EAAE,CAAC;YACpB,GAAG,GAAG,OAAO,CAAC,EAAE,CAAC,IAAI,CAAC,CAAA;YAEtB,IAAI,IAAI,IAAI,GAAG,IAAI,kBAAI,KAAK,EAAE,CAAC,IAAI,EAAE,CAAC;gBACpC,IAAI,UAAU,GACZ,eAAe,CAAC,EAAE,EAAE,KAAK,EAAE,CAAC,GAAG,CAAC,EAAE,EAAE,CAClC,CAAC,CAAC,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,EAAE,EAAE,CAAC,CAAC,GAAG,GAAG,GAAG,CAAC,CAAC,CAAC,CAAA;gBAEpC,KAAK,IAAI,IAAI,IAAI,UAAU,EAAE,CAAC;oBAC5B,IAAI,IAAI,IAAI,CAAC,GAAG,GAAG,OAAO,CAAC,IAAI,CAAC,CAAC,EAAE,CAAC;wBAClC,EAAE,CAAC,IAAI,GAAG,IAAI,CAAA;wBACd,EAAE,CAAC,IAAI,GAAG,CAAC,IAAI,CAAC,KAAK,CAAC,YAAY,CAAC,IAAI,CAAC,kBAAI,EAAE,kBAAI,CAAC,CAAC,CAAC,CAAC,CAAC,CAAA;wBACvD,MAAK;oBACP,CAAC;gBACH,CAAC;YACH,CAAC;QACH,CAAC;QAED,IAAI,GAAG,GAAe;YACpB,GAAG,EAAE;YACL,GAAG;YACH,KAAK,EAAE,IAAI,IAAI,GAAG;SACnB,CAAA;QAED,OAAO,GAAG,CAAA;IACZ,CAAC,CAAA;AACH,CAAC;AAGD,SAAS,iBAAiB,CAAC,OAAuC;IAChE,OAAO,SAAS,aAAa,CAAC,IAAY;QACxC,IAAI,MAAM,GAAG,IAAI,CAAA;QACjB,IAAI,OAAO,CAAC,IAAI,CAAC,EAAE,CAAC;YAClB,MAAM,GAAG,CAAC,IAAI;iBACX,OAAO,CAAC,UAAU,EAAE,EAAE,CAAC;iBACvB,KAAK,CAAC,oBAAoB,CAAC,IAAI,CAAC,EAAE,EAAE,EAAE,CAAC,CAAC,CAAC,CAAC,CAAC,CAAA;QAChD,CAAC;QACD,OAAO,MAAM,CAAA;IACf,CAAC,CAAA;AACH,CAAC;AAGD,SAAgB,eAAe,CAC7B,EAAY,EACZ,KAAyB,EACzB,QAAwC;IACxC,IAAI,IAAI,GAAI,EAAE,CAAC,IAAe,CAAA;IAC9B,IAAI,UAAU,GAAa,EAAE,CAAA;IAC7B,IAAI,UAAU,GAAa,KAAK,CAAC,UAAU,IAAI,EAAE,CAAA;IACjD,IAAI,MAAM,GAAG,IAAI,CAAC,KAAK,CAAC,UAAU,CAAC,IAAI,CAAC,GAAG,CAAC,GAAG,GAAG,CAAC,CAAA;IAEnD,8BAA8B;IAC9B,IAAI,CAAC,MAAM,EAAE,CAAC;QACZ,uBAAuB;QACvB,KAAK,IAAI,GAAG,IAAI,UAAU,EAAE,CAAC;YAC3B,UAAU,CAAC,IAAI,CAAC,IAAI,GAAG,GAAG,CAAC,CAAA;QAC7B,CAAC;QAED,qBAAqB;QACrB,KAAK,IAAI,GAAG,IAAI,UAAU,EAAE,CAAC;YAC3B,UAAU,CAAC,IAAI,CAAC,QAAQ,CAAC,IAAI,EAAE,OAAO,GAAG,GAAG,CAAC,CAAC,CAAA;QAChD,CAAC;QAED,4CAA4C;QAC5C,IAAI,IAAI,IAAI,EAAE,CAAC,IAAI,EAAE,CAAC;YACpB,IAAI,MAAM,GAAG,CAAC,EAAE,CAAC,IAAI;iBAClB,OAAO,CAAC,UAAU,EAAE,EAAE,CAAC;iBACvB,KAAK,CAAC,WAAW,CAAC,IAAI,EAAE,CAAC,CAAC,CAAC,CAAC,CAAA;YAC/B,IAAI,IAAI,IAAI,MAAM,EAAE,CAAC;gBACnB,KAAK,IAAI,GAAG,IAAI,UAAU,EAAE,CAAC;oBAC3B,UAAU,CAAC,IAAI,CAAC,QAAQ,CAAC,IAAI,EAAE,QAAQ,GAAG,MAAM,GAAG,GAAG,CAAC,CAAC,CAAA;gBAC1D,CAAC;YACH,CAAC;QACH,CAAC;IACH,CAAC;IAED,OAAO,UAAU,CAAA;AACnB,CAAC"}
\ No newline at end of file
+{"version":3,"file":"mem.js","sourceRoot":"","sources":["../../src/resolver/mem.ts"],"names":[],"mappings":";AAAA,gFAAgF;;AAMhF,0CAuCC;AAgBD,0CAmCC;AA7FD,gDAA0G;AAG1G,SAAgB,eAAe,CAAC,OAAuC;IAErE,OAAO,SAAS,WAAW,CACzB,IAAS,EACT,KAAyB,EACzB,KAAW,EACX,GAAY;QAEZ,sCAAsC;QAEtC,IAAI,EAAE,GAAG,IAAA,6BAAe,EAAC,KAAK,EAAE,GAAG,EAAE,IAAI,EAAE,iBAAiB,CAAC,OAAO,CAAC,CAAC,CAAA;QACtE,IAAI,GAAG,GAAG,SAAS,CAAA;QAEnB,IAAI,IAAI,IAAI,EAAE,CAAC,IAAI,EAAE,CAAC;YACpB,GAAG,GAAG,OAAO,CAAC,EAAE,CAAC,IAAI,CAAC,CAAA;YAEtB,IAAI,IAAI,IAAI,GAAG,IAAI,kBAAI,KAAK,EAAE,CAAC,IAAI,EAAE,CAAC;gBACpC,IAAI,UAAU,GACZ,eAAe,CAAC,EAAE,EAAE,KAAK,EAAE,CAAC,GAAG,CAAC,EAAE,EAAE,CAClC,CAAC,CAAC,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,EAAE,EAAE,CAAC,CAAC,GAAG,GAAG,GAAG,CAAC,CAAC,CAAC,CAAA;gBAEpC,KAAK,IAAI,IAAI,IAAI,UAAU,EAAE,CAAC;oBAC5B,IAAI,IAAI,IAAI,CAAC,GAAG,GAAG,OAAO,CAAC,IAAI,CAAC,CAAC,EAAE,CAAC;wBAClC,EAAE,CAAC,IAAI,GAAG,IAAI,CAAA;wBACd,EAAE,CAAC,IAAI,GAAG,CAAC,IAAI,CAAC,KAAK,CAAC,YAAY,CAAC,IAAI,CAAC,kBAAI,EAAE,kBAAI,CAAC,CAAC,CAAC,CAAC,CAAC,CAAA;wBACvD,MAAK;oBACP,CAAC;gBACH,CAAC;YACH,CAAC;QACH,CAAC;QAED,IAAI,GAAG,GAAe;YACpB,GAAG,EAAE;YACL,GAAG;YACH,KAAK,EAAE,IAAI,IAAI,GAAG;SACnB,CAAA;QAED,OAAO,GAAG,CAAA;IACZ,CAAC,CAAA;AACH,CAAC;AAGD,SAAS,iBAAiB,CAAC,OAAuC;IAChE,OAAO,SAAS,aAAa,CAAC,IAAY;QACxC,IAAI,MAAM,GAAG,IAAI,CAAA;QACjB,IAAI,OAAO,CAAC,IAAI,CAAC,EAAE,CAAC;YAClB,MAAM,GAAG,CAAC,IAAI;iBACX,OAAO,CAAC,UAAU,EAAE,EAAE,CAAC;iBACvB,KAAK,CAAC,oBAAoB,CAAC,IAAI,CAAC,EAAE,EAAE,EAAE,CAAC,CAAC,CAAC,CAAC,CAAC,CAAA;QAChD,CAAC;QACD,OAAO,MAAM,CAAA;IACf,CAAC,CAAA;AACH,CAAC;AAGD,SAAgB,eAAe,CAC7B,EAAY,EACZ,KAAyB,EACzB,QAAwC;IACxC,IAAI,IAAI,GAAI,EAAE,CAAC,IAAe,CAAA;IAC9B,IAAI,UAAU,GAAa,EAAE,CAAA;IAC7B,IAAI,UAAU,GAAa,KAAK,CAAC,UAAU,IAAI,EAAE,CAAA;IACjD,IAAI,MAAM,GAAG,UAAU,CAAC,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,IAAI,CAAC,QAAQ,CAAC,GAAG,CAAC,CAAC,CAAA;IAEvD,8BAA8B;IAC9B,IAAI,CAAC,MAAM,EAAE,CAAC;QACZ,uBAAuB;QACvB,KAAK,IAAI,GAAG,IAAI,UAAU,EAAE,CAAC;YAC3B,UAAU,CAAC,IAAI,CAAC,IAAI,GAAG,GAAG,CAAC,CAAA;QAC7B,CAAC;QAED,qBAAqB;QACrB,KAAK,IAAI,GAAG,IAAI,UAAU,EAAE,CAAC;YAC3B,UAAU,CAAC,IAAI,CAAC,QAAQ,CAAC,IAAI,EAAE,OAAO,GAAG,GAAG,CAAC,CAAC,CAAA;QAChD,CAAC;QAED,4CAA4C;QAC5C,IAAI,IAAI,IAAI,EAAE,CAAC,IAAI,EAAE,CAAC;YACpB,IAAI,MAAM,GAAG,CAAC,EAAE,CAAC,IAAI;iBAClB,OAAO,CAAC,UAAU,EAAE,EAAE,CAAC;iBACvB,KAAK,CAAC,WAAW,CAAC,IAAI,EAAE,CAAC,CAAC,CAAC,CAAC,CAAA;YAC/B,IAAI,IAAI,IAAI,MAAM,EAAE,CAAC;gBACnB,KAAK,IAAI,GAAG,IAAI,UAAU,EAAE,CAAC;oBAC3B,UAAU,CAAC,IAAI,CAAC,QAAQ,CAAC,IAAI,EAAE,QAAQ,GAAG,MAAM,GAAG,GAAG,CAAC,CAAC,CAAA;gBAC1D,CAAC;YACH,CAAC;QACH,CAAC;IACH,CAAC;IAED,OAAO,UAAU,CAAA;AACnB,CAAC"}
\ No newline at end of file
diff --git a/src/resolver/mem.ts b/src/resolver/mem.ts
index 136c51a..814ffd0 100644
--- a/src/resolver/mem.ts
+++ b/src/resolver/mem.ts
@@ -66,7 +66,7 @@ export function buildPotentials(
   let full = (ps.full as string)
   let potentials: string[] = []
   let implictExt: string[] = popts.implictExt || []
-  let hasExt = full.match(implictExt.join('|') + '$')
+  let hasExt = implictExt.some(ext => full.endsWith(ext))
 
   // TODO: use Jsonic.util.escre
   if (!hasExt) {