diff --git a/build.js b/build.js
index 8f7de4689..5f7fd42a5 100755
--- a/build.js
+++ b/build.js
@@ -1924,6 +1924,13 @@
           source = source.replace(matchFunction(source, 'isPlainObject'), function(match) {
             return match.replace(/!getPrototypeOf[^:]+:\s*/, '');
           });
+
+          // replace `_.isRegExp`
+          source = replaceFunction(source, 'isRegExp', [
+            'function isRegExp(value) {',
+            "  return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false;",
+            '}'
+          ].join('\n'));
         }
       }
       if (isMobile || isUnderscore) {
diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index eb09fed85..1a9f0586d 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -1923,7 +1923,7 @@
      * // => true
      */
     function isRegExp(value) {
-      return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false;
+      return value ? (objectTypes[typeof value] && toString.call(value) == regexpClass) : false;
     }
 
     /**
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index ea2ccfa08..4c32d0048 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -37,7 +37,7 @@ return u},a.reject=function(n,t,e){return t=a.createCallback(t,e),lt(n,function(
 }var u,a,o,i,f=0,l=!0,c=!0;return!1===e?l=!1:e&&q[typeof e]&&(l="leading"in e?e.leading:l,c="trailing"in e?e.trailing:c),function(){var e=new Nt;!i&&!l&&(f=e);var c=t-(e-f);return u=arguments,o=this,0<c?i||(i=Yt(r,c)):(Vt(i),i=null,f=e,a=n.apply(o,u)),a}},a.times=function(n,t,e){n=-1<(n=+n)?n:0;var r=-1,u=It(n);for(t=a.createCallback(t,e,1);++r<n;)u[r]=t(r);return u},a.toArray=function(n){return n&&typeof n.length=="number"?ve.unindexedChars&&ut(n)?n.split(""):J(n):ot(n)},a.union=function(n){return me(n)||(arguments[0]=n?le.call(n):zt),jt(Gt.apply(zt,arguments))
 },a.uniq=jt,a.unzip=function(n){for(var t=-1,e=n?n.length:0,r=e?vt(st(n,"length")):0,u=It(r);++t<e;)for(var a=-1,o=n[t];++a<r;)(u[a]||(u[a]=It(e)))[t]=o[a];return u},a.values=ot,a.where=lt,a.without=function(n){return mt(n,le.call(arguments,1))},a.wrap=function(n,t){return function(){var e=[n];return Wt.apply(e,arguments),t.apply(this,e)}},a.zip=function(n){for(var t=-1,e=n?vt(st(arguments,"length")):0,r=It(e);++t<e;)r[t]=st(arguments,t);return r},a.zipObject=kt,a.collect=st,a.drop=wt,a.each=pt,a.extend=je,a.methods=Y,a.object=kt,a.select=lt,a.tail=wt,a.unique=jt,St(a),a.clone=X,a.cloneDeep=function(n,t,e){return X(n,!0,t,e)
 },a.contains=it,a.escape=function(n){return null==n?"":Tt(n).replace(_,M)},a.every=ft,a.find=ct,a.findIndex=function(n,t,e){var r=-1,u=n?n.length:0;for(t=a.createCallback(t,e);++r<u;)if(t(n[r],r,n))return r;return-1},a.findKey=function(n,t,e){var r;return t=a.createCallback(t,e),Oe(n,function(n,e,u){return t(n,e,u)?(r=e,!1):void 0}),r},a.has=function(n,t){return n?Qt.call(n,t):!1},a.identity=Et,a.indexOf=_t,a.isArguments=W,a.isArray=me,a.isBoolean=function(n){return!0===n||!1===n||Zt.call(n)==O},a.isDate=function(n){return n?typeof n=="object"&&Zt.call(n)==E:!1
-},a.isElement=function(n){return n?1===n.nodeType:!1},a.isEmpty=function(n){var t=!0;if(!n)return t;var e=Zt.call(n),r=n.length;return e==x||e==N||(ve.argsClass?e==k:W(n))||e==I&&typeof r=="number"&&tt(n.splice)?!r:(Oe(n,function(){return t=!1}),t)},a.isEqual=nt,a.isFinite=function(n){return ee(n)&&!re(parseFloat(n))},a.isFunction=tt,a.isNaN=function(n){return rt(n)&&n!=+n},a.isNull=function(n){return null===n},a.isNumber=rt,a.isObject=et,a.isPlainObject=Ee,a.isRegExp=function(n){return n?typeof n=="object"&&Zt.call(n)==P:!1
+},a.isElement=function(n){return n?1===n.nodeType:!1},a.isEmpty=function(n){var t=!0;if(!n)return t;var e=Zt.call(n),r=n.length;return e==x||e==N||(ve.argsClass?e==k:W(n))||e==I&&typeof r=="number"&&tt(n.splice)?!r:(Oe(n,function(){return t=!1}),t)},a.isEqual=nt,a.isFinite=function(n){return ee(n)&&!re(parseFloat(n))},a.isFunction=tt,a.isNaN=function(n){return rt(n)&&n!=+n},a.isNull=function(n){return null===n},a.isNumber=rt,a.isObject=et,a.isPlainObject=Ee,a.isRegExp=function(n){return n?q[typeof n]&&Zt.call(n)==P:!1
 },a.isString=ut,a.isUndefined=function(n){return typeof n=="undefined"},a.lastIndexOf=function(n,t,e){var r=n?n.length:0;for(typeof e=="number"&&(r=(0>e?ae(0,r+e):oe(e,r-1))+1);r--;)if(n[r]===t)return r;return-1},a.mixin=St,a.noConflict=function(){return r._=Kt,this},a.parseInt=Se,a.random=function(n,t){return null==n&&null==t&&(t=1),n=+n||0,null==t&&(t=n,n=0),n+Ht(fe()*((+t||0)-n+1))},a.reduce=gt,a.reduceRight=yt,a.result=function(n,t){var r=n?n[t]:e;return tt(r)?n[t]():r},a.runInContext=t,a.size=function(n){var t=n?n.length:0;
 return typeof t=="number"?t:be(n).length},a.some=ht,a.sortedIndex=Ct,a.template=function(n,t,r){var u=a.templateSettings;n||(n=""),r=ke({},r,u);var o,i=ke({},r.imports,u.imports),u=be(i),i=ot(i),f=0,l=r.interpolate||b,v="__p+='",l=Rt((r.escape||b).source+"|"+l.source+"|"+(l===h?g:b).source+"|"+(r.evaluate||b).source+"|$","g");n.replace(l,function(t,e,r,u,a,i){return r||(r=u),v+=n.slice(f,i).replace(w,K),e&&(v+="'+__e("+e+")+'"),a&&(o=!0,v+="';"+a+";__p+='"),r&&(v+="'+((__t=("+r+"))==null?'':__t)+'"),f=i+t.length,t
 }),v+="';\n",l=r=r.variable,l||(r="obj",v="with("+r+"){"+v+"}"),v=(o?v.replace(c,""):v).replace(p,"$1").replace(s,"$1;"),v="function("+r+"){"+(l?"":r+"||("+r+"={});")+"var __t,__p='',__e=_.escape"+(o?",__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}":";")+v+"return __p}";try{var y=$t(u,"return "+v).apply(e,i)}catch(m){throw m.source=v,m}return t?y(t):(y.source=v,y)},a.unescape=function(n){return null==n?"":Tt(n).replace(v,Q)},a.uniqueId=function(n){var t=++o;return Tt(null==n?"":n)+t
diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index e8ca4040e..2d6cb1700 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -1222,7 +1222,7 @@
    * // => true
    */
   function isRegExp(value) {
-    return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false;
+    return value ? (objectTypes[typeof value] && toString.call(value) == regexpClass) : false;
   }
 
   /**
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index 64cc6a23e..08a58a717 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -27,7 +27,7 @@ u[t]=[o,n[o]]}return u},t.partial=function(n){return e(n,Bt.call(arguments,1))},
 return E(n,function(n){var r=yt(Nt()*(++t+1));e[t]=e[r],e[r]=n}),e},t.sortBy=function(n,t,e){var u=-1,o=n?n.length:0,i=Array(typeof o=="number"?o:0);for(t=P(t,e),E(n,function(n,r,e){i[++u]={a:t(n,r,e),b:u,c:n}}),o=i.length,i.sort(r);o--;)i[o]=i[o].c;return i},t.tap=function(n,t){return t(n),n},t.throttle=function(n,t){function r(){a=new Date,i=null,u=n.apply(o,e)}var e,u,o,i,a=0;return function(){var f=new Date,l=t-(f-a);return e=arguments,o=this,0<l?i||(i=bt(r,l)):(gt(i),i=null,a=f,u=n.apply(o,e)),u
 }},t.times=function(n,t,r){for(var e=-1,u=Array(-1<n?n:0);++e<n;)u[e]=t.call(r,e);return u},t.toArray=function(n){return Ft(n)?Bt.call(n):n&&typeof n.length=="number"?O(n):d(n)},t.union=function(n){return Ft(n)||(arguments[0]=n?Bt.call(n):ct),z(ht.apply(ct,arguments))},t.uniq=z,t.values=d,t.where=F,t.without=function(n){return R(n,Bt.call(arguments,1))},t.wrap=function(n,t){return function(){var r=[n];return _t.apply(r,arguments),t.apply(this,r)}},t.zip=function(n){for(var t=-1,r=n?S(N(arguments,"length")):0,e=Array(r);++t<r;)e[t]=N(arguments,t);
 return e},t.collect=O,t.drop=$,t.each=E,t.extend=c,t.methods=s,t.object=function(n,t){for(var r=-1,e=n?n.length:0,u={};++r<e;){var o=n[r];t?u[o]=t[r]:u[o[0]]=o[1]}return u},t.select=A,t.tail=$,t.unique=z,t.clone=function(n){return m(n)?Ft(n)?Bt.call(n):c({},n):n},t.contains=j,t.escape=function(n){return null==n?"":(n+"").replace(Y,o)},t.every=w,t.find=x,t.findWhere=function(n,t){return F(n,t,!0)},t.has=function(n,t){return n?mt.call(n,t):!1},t.identity=U,t.indexOf=T,t.isArguments=l,t.isArray=Ft,t.isBoolean=function(n){return!0===n||!1===n||dt.call(n)==rt
-},t.isDate=function(n){return n?typeof n=="object"&&dt.call(n)==et:!1},t.isElement=function(n){return n?1===n.nodeType:!1},t.isEmpty=g,t.isEqual=h,t.isFinite=function(n){return At(n)&&!xt(parseFloat(n))},t.isFunction=y,t.isNaN=function(n){return _(n)&&n!=+n},t.isNull=function(n){return null===n},t.isNumber=_,t.isObject=m,t.isRegExp=function(n){return n?typeof n=="object"&&dt.call(n)==it:!1},t.isString=b,t.isUndefined=function(n){return typeof n=="undefined"},t.lastIndexOf=function(n,t,r){var e=n?n.length:0;
+},t.isDate=function(n){return n?typeof n=="object"&&dt.call(n)==et:!1},t.isElement=function(n){return n?1===n.nodeType:!1},t.isEmpty=g,t.isEqual=h,t.isFinite=function(n){return At(n)&&!xt(parseFloat(n))},t.isFunction=y,t.isNaN=function(n){return _(n)&&n!=+n},t.isNull=function(n){return null===n},t.isNumber=_,t.isObject=m,t.isRegExp=function(n){return n?ft[typeof n]&&dt.call(n)==it:!1},t.isString=b,t.isUndefined=function(n){return typeof n=="undefined"},t.lastIndexOf=function(n,t,r){var e=n?n.length:0;
 for(typeof r=="number"&&(e=(0>r?Ot(0,e+r):St(r,e-1))+1);e--;)if(n[e]===t)return e;return-1},t.mixin=V,t.noConflict=function(){return n._=pt,this},t.random=function(n,t){return null==n&&null==t&&(t=1),n=+n||0,null==t&&(t=n,n=0),n+yt(Nt()*((+t||0)-n+1))},t.reduce=B,t.reduceRight=k,t.result=function(n,t){var r=n?n[t]:null;return y(r)?n[t]():r},t.size=function(n){var t=n?n.length:0;return typeof t=="number"?t:Rt(n).length},t.some=q,t.sortedIndex=I,t.template=function(n,r,e){n||(n=""),e=p({},e,t.templateSettings);
 var o=0,i="__p+='",a=e.variable;n.replace(RegExp((e.escape||X).source+"|"+(e.interpolate||X).source+"|"+(e.evaluate||X).source+"|$","g"),function(t,r,e,a,f){return i+=n.slice(o,f).replace(Z,u),r&&(i+="'+_['escape']("+r+")+'"),a&&(i+="';"+a+";__p+='"),e&&(i+="'+((__t=("+e+"))==null?'':__t)+'"),o=f+t.length,t}),i+="';\n",a||(a="obj",i="with("+a+"||{}){"+i+"}"),i="function("+a+"){var __t,__p='',__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}"+i+"return __p}";try{var f=Function("_","return "+i)(t)
 }catch(l){throw l.source=i,l}return r?f(r):(f.source=i,f)},t.unescape=function(n){return null==n?"":(n+"").replace(Q,f)},t.uniqueId=function(n){var t=++J+"";return n?n+t:t},t.all=w,t.any=q,t.detect=x,t.foldl=B,t.foldr=k,t.include=j,t.inject=B,t.first=D,t.last=function(n,t,r){if(n){var e=0,u=n.length;if(typeof t!="number"&&null!=t){var o=u;for(t=P(t,r);o--&&t(n[o],o,n);)e++}else if(e=t,null==e||r)return n[u-1];return Bt.call(n,Ot(0,u-e))}},t.take=D,t.head=D,t.chain=function(n){return n=new i(n),n.__chain__=!0,n
diff --git a/lodash.js b/lodash.js
index 7ef159128..8de7f0ac7 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1932,7 +1932,7 @@
      * // => true
      */
     function isRegExp(value) {
-      return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false;
+      return value ? (objectTypes[typeof value] && toString.call(value) == regexpClass) : false;
     }
 
     /**