diff --git a/beeld.config b/beeld.config
index 3c4d1df..dd99b62 100644
--- a/beeld.config
+++ b/beeld.config
@@ -49,7 +49,7 @@ tasks =[{}]
         replace =[{}]
 
             "@@ROOT@@" = "this"
-            "@@VERSION@@" = "4.0.0"
+            "@@VERSION@@" = "4.0.1"
             "@@MODULE@@" = "CodeMirrorGrammar"
             
         @
diff --git a/build/codemirror_grammar.js b/build/codemirror_grammar.js
index 2db1775..0324896 100644
--- a/build/codemirror_grammar.js
+++ b/build/codemirror_grammar.js
@@ -1,7 +1,7 @@
 /**
 *
 *   CodeMirrorGrammar
-*   @version: 4.0.0
+*   @version: 4.0.1
 *
 *   Transform a grammar specification in JSON format, into a syntax-highlight parser mode for CodeMirror
 *   https://github.com/foo123/codemirror-grammar
@@ -23,7 +23,7 @@ else if ( !(name in root) ) /* Browser/WebWorker/.. */
 "use strict";
 /**
 *   EditorGrammar Codebase
-*   @version: 4.0.0
+*   @version: 4.0.1
 *
 *   https://github.com/foo123/editor-grammar
 **/
@@ -533,7 +533,10 @@ function esc_re( s )
 
 function new_re( re, fl )
 {
-    return new RegExp(re, fl||'');
+    fl = fl || {l:0,x:0,i:0,g:0};
+    var re = new RegExp(re, (fl.g?'g':'')+(fl.i?'i':''));
+    re.xflags = fl;
+    return re;
 }
 
 function get_delimited( src, delim, esc, collapse_esc )
@@ -587,7 +590,7 @@ function group_replace( pattern, token, raw, in_regex )
     while ( i<l )
     {
         c = pattern[CHAR](i);
-        if ( (i+1<l) && placeholder === c )
+        if ( (i+1<l) && (placeholder === c) )
         {
             g = pattern.charCodeAt(i+1);
             if ( placeholder_code === g ) // escaped placeholder character
@@ -619,16 +622,14 @@ function get_re( r, rid, cachedRegexes, boundary )
 {
     if ( !r || ((T_NUM|T_REGEX) & get_type(r)) ) return r;
     
-    var l = rid ? (rid.length||0) : 0, i, b = "";
+    var l = rid ? (rid.length||0) : 0, i, b = "", xflags = {g:0,i:0,x:0,l:0};
 
     if ( T_STR & get_type(boundary) ) b = boundary;
     else if ( !!boundary ) b = combine_delimiter;
     
-    if ( l && rid === r.substr(0, l) ) 
+    if ( l && (r.substr(0, l) === rid) ) 
     {
-        var regexSource = r.substr(l), delim = regexSource[CHAR](0), flags = '',
-            regexBody, regexID, regex, i, ch
-        ;
+        var regexSource = r.substr(l), delim = regexSource[CHAR](0), regexBody, regexID, regex, i, ch;
         
         // allow regex to have delimiters and flags
         // delimiter is defined as the first character after the regexID
@@ -637,14 +638,27 @@ function get_re( r, rid, cachedRegexes, boundary )
         {
             ch = regexSource[CHAR](i);
             if ( delim === ch ) break;
-            else if ('i' === ch.toLowerCase() ) flags = 'i';
+            else if ('i' === ch.toLowerCase()) xflags.i = 1;
+            else if ('x' === ch.toLowerCase()) xflags.x = 1;
+            else if ('l' === ch.toLowerCase()) xflags.l = 1;
         }
         regexBody = regexSource.substring(1, i);
-        regexID = "^(" + regexBody + ")";
+        if ( '^' === regexBody.charAt(0) )
+        {
+            xflags.l = 1;
+            regexID = "^(" + regexBody.slice(1) + ")";
+        }
+        else
+        {
+            regexID = "^(" + regexBody + ")";
+        }
+        regex = regexID;
+        if ( xflags.x || xflags.l || xflags.i )
+            regexID = (xflags.l?'l':'')+(xflags.x?'x':'')+(xflags.i?'i':'')+'::'+regexID;
         
         if ( !cachedRegexes[ regexID ] )
         {
-            regex = new_re( regexID, flags );
+            regex = new_re( regex, xflags );
             // shared, light-weight
             cachedRegexes[ regexID ] = regex;
         }
@@ -653,11 +667,11 @@ function get_re( r, rid, cachedRegexes, boundary )
     }
     else if ( !!b )
     {
-        regexID = "^(" + esc_re( r ) + ")"+b;
+        regex = regexID = "^(" + esc_re( r ) + ")"+b;
         
         if ( !cachedRegexes[ regexID ] )
         {
-            regex = new_re( regexID, flags );
+            regex = new_re( regex, xflags );
             // shared, light-weight
             cachedRegexes[ regexID ] = regex;
         }
@@ -676,7 +690,7 @@ function get_combined_re( tokens, boundary, case_insensitive )
     if ( T_STR & get_type(boundary) ) b = boundary;
     else if ( !!boundary ) b = combine_delimiter;
     combined = map( tokens.sort( by_length ), esc_re ).join( "|" );
-    return [ new_re("^(" + combined + ")"+b, case_insensitive ? "i": ""), 1 ];
+    return [ new_re("^(" + combined + ")"+b, {l:0,x:0,i:case_insensitive?1:0}), 1 ];
 }
 
 
@@ -781,7 +795,7 @@ function get_compositematcher( name, tokens, RegExpID, combined, caseInsensitive
     return cachedMatchers[ name ] = mtcher;
 }
 
-var regex_pattern_re = /(\\\\)*?\\\d/;
+var /*regex_pattern_re = /(\\\\)*?\\\d/,*/ extended_regex_re = /(l?i?l?)x(l?i?l?)$/;
 function get_blockmatcher( name, tokens, RegExpID, cachedRegexes, cachedMatchers ) 
 {
     if ( cachedMatchers[ name ] ) return cachedMatchers[ name ];
@@ -791,12 +805,12 @@ function get_blockmatcher( name, tokens, RegExpID, cachedRegexes, cachedMatchers
     // build start/end mappings
     iterate(function( i ) {
         var t1, t2, is_regex, is_regex_pattern;
-        t1= get_simplematcher( name + '_0_' + i, get_re( tmp[i][0], RegExpID, cachedRegexes ), i, cachedMatchers );
+        t1 = get_simplematcher( name + '_0_' + i, get_re( tmp[i][0], RegExpID, cachedRegexes ), i, cachedMatchers );
         if ( tmp[i].length > 1 )
         {
             is_regex = has_prefix( tmp[i][1], RegExpID );
-            is_regex_pattern = is_regex && regex_pattern_re.test(tmp[i][1]);
-            if ( T_REGEX === t1.ptype && T_STR === get_type( tmp[i][1] ) && (is_regex_pattern || !is_regex) )
+            is_regex_pattern = is_regex && /*regex_pattern_re*/extended_regex_re.test(tmp[i][1]);
+            if ( (T_REGEX === t1.ptype) && (T_STR === get_type( tmp[i][1] )) && (is_regex_pattern || !is_regex) )
             {
                 if ( is_regex_pattern )
                 {
@@ -1488,7 +1502,7 @@ function parse_peg_bnf_notation( tok, Lex, Syntax )
                     {
                         if ( t.pos < t.length && 'i' === t[CHAR](t.pos) ) { t.pos++; fl = 'i'; }
                         curr_token = '/' + literal + '/' + fl;
-                        if ( !Lex[curr_token] ) Lex[curr_token] = { type:'simple', tokens:new_re("^("+literal+")",fl) };
+                        if ( !Lex[curr_token] ) Lex[curr_token] = { type:'simple', tokens:new_re("^("+literal+")",{l:0,x:0,i:'i'===fl}) };
                         sequence.push( curr_token );
                     }
                     /*}
@@ -1506,7 +1520,7 @@ function parse_peg_bnf_notation( tok, Lex, Syntax )
                             Syntax[ curr_token ] = {
                                 type:'*' === c ? 'zeroOrMore' : ('+' === c ? 'oneOrMore' : 'zeroOrOne'),
                                 tokens:[prev_token]
-                            }
+                            };
                         sequence[sequence.length-1] = curr_token;
                     }
                     else token += c;
@@ -1563,7 +1577,7 @@ function parse_peg_bnf_notation( tok, Lex, Syntax )
                             Syntax[ curr_token ] = {
                                 type:'!' === c ? 'negativeLookahead' : 'positiveLookahead',
                                 tokens:[prev_token]
-                            }
+                            };
                         sequence[sequence.length-1] = curr_token;
                     }
                     else token += c;
@@ -2210,7 +2224,7 @@ function t_match( t, stream, eat, any_match )
                 if ( end.regex_pattern )
                 {
                     // dynamicaly-created regex with substistution group as well
-                    m = group_replace( end, match[1], 0, 1 );
+                    m = group_replace( end, match[1]/*, 0, 1*/ );
                     end = new matcher( P_SIMPLE, name+'_End', get_re(m, end.regex_pattern, {}), T_REGEX );
                 }
                 else
@@ -2243,8 +2257,8 @@ function t_match( t, stream, eat, any_match )
         }
         else if ( T_REGEX === type )
         {
-            m = stream.slice( stream.pos ).match( pattern[0] );
-            if ( m && 0 === m.index )
+            m = pattern[0].xflags.l ? stream.match( pattern[0] ) : stream.slice( stream.pos ).match( pattern[0] );
+            if ( m && (0 === m.index) )
             {
                 if ( false !== eat ) stream.mov( m[ pattern[1]||0 ].length );
                 return [ key, pattern[1] > 0 ? m[pattern[1]] : m ];
@@ -3361,11 +3375,12 @@ function State( unique, s )
         }
         self.$eol$ = true; self.$blank$ = true;
     }
-    // make sure to generate a string which will cover most cases where state needs to be updated by the editor
-    self.toString = function() {
-        return self.id+'_'+self.line+'_'+self.bline+'_'+(self.block?self.block.name:'0');
-    };
 }
+// make sure to generate a string which will cover most cases where state needs to be updated by the editor
+State.prototype.toString = function( ){
+    var self = this;
+    return self.id+'_'+self.line+'_'+self.bline+'_'+(self.block?self.block.name:'0');
+};
 
 function state_backup( state, stream, backup, with_errors )
 {
@@ -4257,7 +4272,7 @@ var Folder = {
     ,MarkedUp: function( T, L, R, S, M ) {
         T = T || TRUE;
         L = L || "<"; R = R || ">"; S = S || "/";
-        M = M || new_re( esc_re(L) + "(" + esc_re(S) + "?)([a-zA-Z_\\-][a-zA-Z0-9_\\-:]*)", "g" );
+        M = M || new_re( esc_re(L) + "(" + esc_re(S) + "?)([a-zA-Z_\\-][a-zA-Z0-9_\\-:]*)", {g:1} );
 
         return function fold_markup( iter ) {
             iter.col = 0; iter.min = iter.first( ); iter.max = iter.last( );
@@ -4389,7 +4404,7 @@ var Matcher = {
 /**
 *
 *   CodeMirrorGrammar
-*   @version: 4.0.0
+*   @version: 4.0.1
 *
 *   Transform a grammar specification in JSON format, into a syntax-highlight parser mode for CodeMirror
 *   https://github.com/foo123/codemirror-grammar
@@ -4932,7 +4947,7 @@ function get_mode( grammar, DEFAULT, CodeMirror )
 [/DOC_MARKDOWN]**/
 var CodeMirrorGrammar = {
     
-    VERSION: "4.0.0",
+    VERSION: "4.0.1",
     
     // clone a grammar
     /**[DOC_MARKDOWN]
diff --git a/build/codemirror_grammar.min.js b/build/codemirror_grammar.min.js
index 9c69668..8802f9b 100644
--- a/build/codemirror_grammar.min.js
+++ b/build/codemirror_grammar.min.js
@@ -1,11 +1,11 @@
 /**
 *
 *   CodeMirrorGrammar
-*   @version: 4.0.0
+*   @version: 4.0.1
 *
 *   Transform a grammar specification in JSON format, into a syntax-highlight parser mode for CodeMirror
 *   https://github.com/foo123/codemirror-grammar
 *   https://github.com/foo123/editor-grammar
 *
-**/!function(e,t,n){"use strict";"object"==typeof module&&module.exports?(module.$deps=module.$deps||{})&&(module.exports=module.$deps[t]=n.call(e)):"function"==typeof define&&define.amd&&"function"==typeof require&&"function"==typeof require.specified&&require.specified(t)?define(t,["module"],function(t){return n.moduleUri=t.uri,n.call(e)}):t in e||(e[t]=n.call(e)||1)&&"function"==typeof define&&define.amd&&define(function(){return e[t]})}(this,"CodeMirrorGrammar",function(){"use strict";function e(e){var t=0;return null===e?t=xt:!0===e||!1===e||e instanceof Boolean?t=_t:at===e?t=vt:(t=Rt[mt.call(e)]||bt,t=wt===t||e instanceof Number?isNaN(e)?Ot:isFinite(e)?wt:Ct:Lt===t||e instanceof String?1===e.length?St:Lt:Et===t||e instanceof Array?Et:Pt===t||e instanceof RegExp?Pt:Dt===t||e instanceof Date?Dt:qt===t||e instanceof Function?qt:Tt===t?Tt:bt),t}function t(e,t,n,r){var 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n.$subgrammars[e]:t&&(n.$subgrammars[e]=t),n},iterator:function(){},validate:function(){},autocomplete:function(){},indent:function(){},fold:function(){},match:function(){}}),Xt={Pattern:function(e,t,n){return function(){}},Indented:function(e){return e=e||re.$NOTEMPTY$,function(t){var n,r,o,s,l,i,a,u,c,p=t.row;if(n=t.line(p),e.test(n)){for(r=t.indentation(n),i=null,l=n.length,u=p+1,c=t.last();c>=u;++u)if(o=t.line(u),s=t.indentation(o),s>r)i=u,a=o.length;else if(e.test(o))break;return i?[p,l,i,a]:void 0}}},Delimited:function(e,t,n,r){return e&&t&&e.length&&t.length?(n=n||l,function(o){var s,l,i,a,u,c,p=o.row,f=o.col;for(s=o.line(p),i=f,a=0;;){var u=0>=i?-1:s.lastIndexOf(e,i-1);if(-1!==u){if(1===a&&f>u)return;if(n(c=o.token(p,u+1))){l=u+e.length;break}i=u-1}else{if(1===a)return;a=1,i=s.length}}return ae(1,o,p,l,c,e,t,n,!0,r)}):function(){}},MarkedUp:function(e,t,n,r,o){return e=e||l,t=t||"<",n=n||">",r=r||"/",o=o||y($(t)+"("+$(r)+"?)([a-zA-Z_\\-][a-zA-Z0-9_\\-:]*)",{g:1}),function(s){s.col=0,s.min=s.first(),s.max=s.last(),s.text=s.line(s.row);for(var l,i,a,u,c,p,f,m,h,g=s.row;;){if(l=le(s,e,o,t,n,r),!l||s.row!==g||!(i=ie(s,e,o,t,n,r)))return;if(!l[1]&&"autoclosed"!==i)for(a=[s.row,s.col],c=l[2],u=null,p=[];;){if(f=le(s,e,o,t,n,r),g=s.row,m=s.col-(f?f[0].length:0),!f||!(i=ie(s,e,o,t,n,r)))return!1;if("autoclosed"!==i)if(f[1]){for(h=p.length-1;h>=0;--h)if(p[h]===f[2]){p.length=h;break}if(0>h&&(!c||c===f[2]))return[a[0],a[1],g,m]}else p.push(f[2])}}}}},en={Pattern:function(e,t,n){return function(){}},Delimited:function(e,t,n,r){return e&&t&&e.length&&t.length?(n=n||l,function(o){var s,l=o.col,i=o.row,a=o.line(i),u=!1,c=e.length,p=t.length;return l>=c&&(1===c&&e===a.charAt(l-1)||e===a.slice(l-c,l))?(s=ae(1,o,i,l,u,e,t,n,!1,r),s?(s=[s[0],s[1]-c,s[0],s[1],s[2],s[3],s[2],s[3]+p],s.match="end"):(s=[i,l-c,i,l],s.match=!1),s):l>=p&&(1===p&&t===a.charAt(l-1)||t===a.slice(l-p,l))?(s=ae(-1,o,i,l-p,u,e,t,n,!1,r),s?(s=[s[0],s[1],s[0],s[1]+c,s[2],s[3],s[2],s[3]+p],s.match="start"):(s=[i,l-p,i,l],s.match=!1),s):void 0}):function(){}},MarkedUp:function(e,t,n,r,o){return function(){}}},tn="undefined"!=typeof CodeMirror?CodeMirror:{Pass:{toString:function(){return"CodeMirror.Pass"}}},nn=/[\w$]/,rn=function(e,t){return t.score-e.score},on=h(Qt,{constructor:function ln(t,n){var o,s=this,i=null,a=null;if(Qt.call(s,t,null,"error"),s.DEF=n||s.$DEF,s.ERR=t.Style.error||s.$ERR,s.LC=t.$comments.line?t.$comments.line[0]:null,s.BCS=t.$comments.block?t.$comments.block[0][0]:null,s.BCE=t.$comments.block?t.$comments.block[0][1]:null,s.BCC=s.BCL=t.$comments.block?t.$comments.block[0][2]:null,t.$comments.block&&t.$comments.block.length){o=ln.Type("comment");for(var u=0,c=t.$comments.block.length;c>u;u++)s.$folders.push(ln.Fold.Delimited(t.$comments.block[u][0],t.$comments.block[u][1],o,"comment"))}t.Fold&&_t&e(t.Fold)?i=t.Fold[dt]():t.$extra.fold&&(i=t.$extra.fold[dt]()),a=t.Match&&_t&e(t.Match)?t.Match[dt]():t.$extra.match?t.$extra.match[dt]():i;var p=F(t,1);o=p.length?ln.Type(p,!1):l,i&&(i=i.split("+"),r(function(e,t){var n,r=Bt(t[e]);"braces"===r?s.$folders.push(ln.Fold.Delimited("{","}",o)):"brackets"===r?s.$folders.push(ln.Fold.Delimited("[","]",o)):"parens"===r||"parentheses"===r?s.$folders.push(ln.Fold.Delimited("(",")",o)):"brace"===r||"cstyle"===r||"c"===r?(s.$folders.push(ln.Fold.Delimited("{","}",o)),s.$folders.push(ln.Fold.Delimited("[","]",o))):"indent"===r||"indentation"===r?s.$folders.push(ln.Fold.Indented()):"tags"===r||"markup"===r||"html"===r||"xml"===r?(s.$folders.push(ln.Fold.Delimited("<![CDATA[","]]>",ln.Type(["comment","tag"],!1))),s.$folders.push(ln.Fold.MarkedUp(ln.Type("tag"),"<",">","/"))):-1<(n=r.indexOf(","))&&s.$folders.push(ln.Fold.Delimited(r.slice(0,n),r.slice(n+1),o))},0,i.length-1,i)),a&&(a=a.split("+"),r(function(e,t){var n,r=Bt(t[e]);"braces"===r?s.$matchers.push(ln.Match.Delimited("{","}")):"brackets"===r?s.$matchers.push(ln.Match.Delimited("[","]")):"parens"===r||"parentheses"===r?s.$matchers.push(ln.Match.Delimited("(",")")):"brace"===r||"cstyle"===r||"c"===r?(s.$matchers.push(ln.Match.Delimited("{","}")),s.$matchers.push(ln.Match.Delimited("[","]")),s.$matchers.push(ln.Match.Delimited("(",")"))):"tags"===r||"markup"===r||"html"===r||"xml"===r?s.$matchers.push(ln.Match.MarkedUp(ln.Type("tag"),"<",">","/")):-1<(n=r.indexOf(","))&&s.$matchers.push(ln.Match.Delimited(r.slice(0,n),r.slice(n+1)))},0,a.length-1,a))},LC:null,BCS:null,BCE:null,BCL:null,BCC:null,dispose:function(){var e=this;return e.LC=e.BCS=e.BCE=e.BCL=e.BCC=null,Qt[ut].dispose.call(e)},validate:function(e,t,n){if(!e||!e.length)return[];var r,o,s,l,i=this,a=[],u=i.parse(e,fe);if(!u)return a;t=t||{},s=t[ct]("type")?t.type:"error",l=t[ct]("msg")?t.msg:"Syntax Error";for(r in 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e=this;if(!(e.row>=e.max))return e.col=0,e.row++,!0},prev:function(){var e=this;if(!(e.row<=e.min))return e.col=0,e.row--,!0},indentation:function(e){return oe(e,null,n)},state:function(n,r){var o=e.getTokenAt(t.Pos(n,r||0)).state;return o.state||o},token:function(n,r){return e.getTokenTypeAt(t.Pos(n,r||0))},tokens:function(t){return e.getLineTokens(t)}}},fold:function(e,t,n){var r,o,s,l=this,i=l.$folders,a=i.length;if(a)for(o=l.iterator(e,n),o.row=t.line,o.col=t.ch||0,r=0;a>r;r++)if((s=i[r](o))||!1===s)return s},match:function(e,t,n){var r,o,s,l=this,i=l.$matchers,a=i.length;if(a)for(o=l.iterator(e,n),o.row=t.line,o.col=t.ch||0,r=0;a>r;r++)if((s=i[r](o))||!1===s)return s}});on.Type=se,on.Fold=Xt,on.Match=en;var sn={VERSION:"4.0.1",clone:o,extend:s,pre_process:N,parse:A,getMode:ce,Parser:on};return sn});
\ No newline at end of file
diff --git a/editor-grammar b/editor-grammar
index ad1d812..21a3d04 160000
--- a/editor-grammar
+++ b/editor-grammar
@@ -1 +1 @@
-Subproject commit ad1d8123832af71bd20767a1e23e0f1c0dbdc61d
+Subproject commit 21a3d04bc5e2b1e1b67e5084e731495bd95cb14b
diff --git a/test/grammars/php.js b/test/grammars/php.js
index 703e159..91f4837 100644
--- a/test/grammars/php.js
+++ b/test/grammars/php.js
@@ -35,7 +35,7 @@ var php_grammar = {
 "Lex"                       : {
     
      "comment:comment"      : [["//", null],["#", null],["/*", "*/"]]
-    ,"heredoc:block"        : ["RE::/<<<([_A-Za-z][_A-Za-z0-9]*)/",   "RE::/^(\\1)/"]
+    ,"heredoc:block"        : ["RE::/<<<([_A-Za-z][_A-Za-z0-9]*)/",   "RE::/^$1/x"]
     ,"string:escaped-block" : ["RE::/([`'\"])/", 1]
     ,"identifier"           : "RE::/[_A-Za-z][_A-Za-z0-9]*/"
     ,"variable"             : "RE::/\\$[_A-Za-z][_A-Za-z0-9]*/"