diff --git a/src/stubser/cfile_parser.c b/src/stubser/cfile_parser.c
index 7923294..826c501 100644
--- a/src/stubser/cfile_parser.c
+++ b/src/stubser/cfile_parser.c
@@ -46,7 +46,6 @@ STATIC regex_t regXparameter;
 STATIC regex_t regXvariable;
 
 STATIC regex_t regXExpressionStart;
-STATIC regex_t regXExpressionAssign;
 STATIC regex_t regXExpressionEnd;
 
 // line evaluation related variables
@@ -61,11 +60,6 @@ int8_t cfile_parser_init()
       perror("Error regex\n");
       return -1;
    }
-   if (0 > regcomp(&regXExpressionAssign, CPARS_EXPRESSION_EXPEND, (REG_EXTENDED | REG_NEWLINE)))
-   {
-      perror("Error regex\n");
-      return -1;
-   }
    if (0 > regcomp(&regXExpressionEnd, CPARS_EXPRESSION_END, (REG_EXTENDED | REG_NEWLINE)))
    {
       perror("Error regex\n");
@@ -650,49 +644,30 @@ STATIC cfunction_t* cfile_parser_evaluateLine1(char *aLine)
 }
 #endif
 
-STATIC bool workerActive = false;
-const stringWorker cWorker[2] =
-{ cfile_expWorker, // Parse for variables
-      NULL };
-STATIC char *match = NULL;
 STATIC int8_t cfile_parser_evaluateLine(uint32_t aNumber, char *aLine, cfile_t *aCfile)
 {
-   stringWorker *worker = (stringWorker*) cWorker;
    char *position = aLine;
-   char *result = NULL;
-   size_t cSize = 0;
+   int8_t result = 0;
+   static char *match = NULL;
+   static uint8_t depth = 0;
 
    regex_t *matchStart = &regXExpressionStart;
    regex_t *matchEnd = &regXExpressionEnd;
 
-   DEBUG_LOG_APPEND(1, "[ Li %04u] %s\n", aNumber, aLine);
-   // start with variable worker
-
-   while (position && NULL != *worker)
+   while (position)
    {
-      result = (*worker)(&position, matchStart, matchEnd, &workerActive, &cSize);
-      if (NULL == result)
+      result = regExWorker(&match, &position, matchStart, matchEnd, &depth, false);
+      if (match && 0 == result && 0 == depth)
       {
-         if (false == workerActive)
-         {
-            xfree((void**) &match);
-            ++worker;
-         }
-         continue;
-      }
-      xmallocStrlcat(&match, result, cSize);
-
-      if (false == workerActive)
-      {
-         DEBUG_LOG_APPEND(1, "Works %zu %s\n", cSize, match);
-         // TODO evaluate expression according to worker
+         DEBUG_LOG_APPEND(1, "[ Re %04u] Works %zu %s\n", aNumber, strlen(match), match);
          xfree((void**) &match);
-         worker = (stringWorker*) cWorker;
       }
-      else
+      if (0 > result)
       {
-         // force space between findings
-         xmallocStrlcat(&match, " ", 2);
+         if (-2 == result)
+            DEBUG_LOG_APPEND(2, "[ PEr]");
+         position = NULL;
+         xfree((void**) &match);
       }
    }
    return 0;
@@ -703,9 +678,11 @@ int8_t cfile_parser(char *aPath, cfile_t *aCfile)
    FILE *fdesc;
    ssize_t charRead = 0;
    size_t lineSize = 0;
-   uint32_t lineNumber = 1;
+   uint32_t lineNumber = 0;
    char *cTemp = NULL;
    char *fileLine = NULL; // will be allocated by getline(); must be freed
+   int8_t ret = 0;
+   uint8_t warningCounter = 0;
 
    if (false == cfile_parser_initialized)
    {
@@ -724,14 +701,26 @@ int8_t cfile_parser(char *aPath, cfile_t *aCfile)
       charRead = getline(&fileLine, &lineSize, fdesc);
       if (0 <= charRead)
       {
-         if (0 != removeCcomments(fileLine))
+         lineNumber++;
+         ret = removeCcomments(fileLine);
+         if (-1 == ret)
+         {
+            ++warningCounter;
+         }
+         else if (0 != ret)
          {
             continue;
          }
-         if (0 != cBlockRemoval(fileLine, "{", "}", &cfile_parser_removeBraceHelper, false, false))
+         ret = cBlockRemoval(fileLine, "{", "}", &cfile_parser_removeBraceHelper, false, false);
+         if (-1 == ret)
+         {
+            ++warningCounter;
+         }
+         else if (0 != ret)
          {
             continue;
          }
+         DEBUG_LOG_APPEND(2, "[ Li %04u] %s", lineNumber, fileLine);
          cTemp = strrchr(fileLine, '\n');
          if (cTemp)
          {
@@ -742,7 +731,7 @@ int8_t cfile_parser(char *aPath, cfile_t *aCfile)
          {
             *cTemp = '\0';
          }
-         (void) cfile_parser_evaluateLine(lineNumber++, fileLine, aCfile);
+         (void) cfile_parser_evaluateLine(lineNumber, fileLine, aCfile);
       }
    } while (0 <= charRead);
 
@@ -756,7 +745,7 @@ int8_t cfile_parser(char *aPath, cfile_t *aCfile)
             cfile_parser_parameterStorage);
       cfile_parser_removeCommentHelper = 0;
       cfile_parser_removeBraceHelper = 0;
-      return -2;
+      ret = -2;
    }
 
    // error detection for function parameter detection
@@ -765,8 +754,13 @@ int8_t cfile_parser(char *aPath, cfile_t *aCfile)
       DEBUG_LOG_APPEND(1, "Function parameter not free: %s\n", cfile_parser_parameterStorage);
       free(cfile_parser_parameterStorage);
       cfile_parser_parameterStorage = NULL;
-      return -3;
+      ret = -3;
    }
 
-   return 0;
+   if (warningCounter && 0 <= ret)
+   {
+      ret = -4;
+   }
+
+   return ret;
 }
diff --git a/src/stubser/cfile_parser_loc.h b/src/stubser/cfile_parser_loc.h
index 393142b..c18226b 100644
--- a/src/stubser/cfile_parser_loc.h
+++ b/src/stubser/cfile_parser_loc.h
@@ -33,8 +33,7 @@
 #define CPARS_REGEX_PARAMETER "[[:blank:]]*([ _\\*[:alnum:]]* +\\**)([_\\*[:alnum:]]*)[[:blank:]]*"
 #define CPARS_REGEX_PREFIX "(extern|EXTERN|static|STATIC|volatile|near|far)[[:blank:]]+([^\\*]*\\**)"
 
-#define CPARS_EXPRESSION_START "^[[:blank:]]*([A-Za-z][\\_\\*[:alnum:]]*)"
-#define CPARS_EXPRESSION_EXPEND "[[:blank:]]*([=\{])[[:blank:]]*"
+#define CPARS_EXPRESSION_START "^[[:blank:]]*([A-Za-z\\_][\\_\\*[:alnum:]]*)"
 #define CPARS_EXPRESSION_END "[[:blank:]]*([\\};]+)"
 
 #define CFILE_PARSER_IS_MATCHGROUP_FUNCTION(matchGroup) (XREGEX_IS_MATCHGROUP(matchGroup, 1) && XREGEX_IS_MATCHGROUP(matchGroup, 2))
diff --git a/src/stubser/cfile_parser_worker.c b/src/stubser/cfile_parser_worker.c
index 0e7d4a4..1f40c9f 100644
--- a/src/stubser/cfile_parser_worker.c
+++ b/src/stubser/cfile_parser_worker.c
@@ -13,57 +13,129 @@
 
 #include "xtypes.h"
 #include "xregex.h"
+#include "xmalloc.h"
 #include "debug.h"
 #include "cfile_parser_loc.h"
 #include "cfile_parser_worker_loc.h"
 
-char* cfile_expWorker(char **aInput, const regex_t *aStart, const regex_t *aEnd, bool *aActive, size_t *aSize)
+/*!
+ * @brief String block detection using regular expressions
+ * @param [out] **aOutput Matched group content across multiple calls (will be allocated as needed)
+ * @param [in,out] **aInput Char pointer to search string (will be moved to position after match)
+ * @return Matched string and various information about the parsing
+ * @retval 0 parsing done (aBlockDepth = 0) or in progress (aBlockDepth > 0)
+ * @retval -1 parsing ended without result
+ * @retval -2 parsing error (end without start)
+ */
+int8_t regExWorker(char **aOutput, char **aInput, const regex_t *aStart, const regex_t *aEnd, uint8_t *aBlockDepth, bool aMultiLevel)
 {
-   regmatch_t matchGroup[CFILE_PARSER_MAX_REGEX_MATCHING_GROUPS];
-   char *begin;
+   regmatch_t matchStart[2];
+   regmatch_t matchEnd[2];
+   regmatch_t *match = NULL;
+   char *begin = NULL;
+   size_t size = 0;
+   int8_t ret = -1;
 
-   if (!**aInput)
+   if (!**aInput || NULL == *aInput)
    {
-      *aInput = NULL;
-      return NULL;
-   }
-   if (!*aActive)
-   {
-      *aSize = 0;
-      begin = NULL;
-   }
-   else
-   {
-      begin = *aInput;
-   }
-
-   if (*aActive)
-   {
-      if (aEnd != NULL && 0 == regexec(aEnd, *aInput, CFILE_PARSER_MAX_REGEX_MATCHING_GROUPS, matchGroup, REG_NOTEOL) && XREGEX_IS_MATCHGROUP(matchGroup, 1))
+      if (*aBlockDepth)
       {
-         DEBUG_LOG_APPEND(1, "[ CEe]");
-         *aActive = false;
-         *aSize += matchGroup[1].rm_so; // don't include end marker in result
-         *aInput += matchGroup[1].rm_eo;
-         return begin;
+         xmallocStrlcat(aOutput, " ", 2);
+         ret = 0;
       }
       else
       {
-         DEBUG_LOG_APPEND(1, "[ CE+]");
-         *aSize += strlen(*aInput);
-         *aInput += strlen(*aInput);
-         return begin;
+         ret = -1;
       }
-   }
-   else if (0 == regexec(aStart, *aInput, CFILE_PARSER_MAX_REGEX_MATCHING_GROUPS, matchGroup, REG_NOTEOL) && XREGEX_IS_MATCHGROUP(matchGroup, 1))
-   {
-      DEBUG_LOG_APPEND(1, "[ CEs]");
-      *aActive = true;
-      *aSize += XREGEX_SIZEOF_MATCHGROUP(matchGroup, 1);
-      begin = *aInput + matchGroup[1].rm_so;
-      *aInput += matchGroup[1].rm_eo;
-      cfile_expWorker(aInput, aStart, aEnd, aActive, aSize);
+      *aInput = NULL;
+      goto regExWorker_end;
    }
 
-   return begin;
+   // start
+   if (0 == regexec(aStart, *aInput, 2, matchStart, REG_NOTEOL) && XREGEX_IS_MATCHGROUP(matchStart, 1))
+   {
+      match = matchStart;
+   }
+
+   // end < start
+   if (0 == regexec(aEnd, *aInput, 2, matchEnd, REG_NOTEOL) && XREGEX_IS_MATCHGROUP(matchEnd, 1))
+   {
+      if (match && match->rm_so > matchEnd[1].rm_so)
+      {
+         match = matchEnd;
+      }
+      else if (!match)
+      {
+         match = matchEnd;
+      }
+   }
+
+   if (*aBlockDepth)
+   {
+      begin = *aInput;
+      size = strlen(*aInput);
+      if (!match)
+      {
+         *aInput += strlen(*aInput);
+         ret = 0;
+         goto regExWorker_end;
+      }
+   }
+   else
+   {
+      begin = NULL;
+      // no findings
+      if (!match)
+      {
+         ret = -1;
+         goto regExWorker_end;
+      }
+   }
+
+   // start && aDepth > 0 -> ignore
+   if (match == matchStart)
+   {
+      if ((*aBlockDepth && aMultiLevel) || 0 == *aBlockDepth)
+      {
+         DEBUG_LOG_APPEND(2, "[ CEs]");
+         ++*aBlockDepth;
+         size = XREGEX_SIZEOF_MATCHGROUP(match, 1);
+         //begin = *aInput + match[1].rm_eo; // don't include end marker in result
+         begin = *aInput + match[1].rm_so; // include end marker in result
+         *aInput += match[1].rm_eo;
+      }
+      else
+      {
+         // ignore starts within block
+         size = match->rm_eo;
+         *aInput += match->rm_eo;
+      }
+      ret = 0;
+      goto regExWorker_end;
+   }
+
+   if (match == matchEnd)
+   {
+      DEBUG_LOG_APPEND(2, "[ CEe]");
+      if (0 < *aBlockDepth)
+         --*aBlockDepth;
+      //size = match[1].rm_so; // don't include end marker in result
+      size = match[1].rm_eo; // include end marker in result
+      *aInput += match[1].rm_eo;
+      ret = 0;
+      goto regExWorker_end;
+   }
+
+   regExWorker_end:
+
+   if (begin)
+   {
+      xmallocStrlcat(aOutput, begin, size);
+      if (*aBlockDepth)
+      {
+         (void) regExWorker(aOutput, aInput, aStart, aEnd, aBlockDepth, aMultiLevel);
+      }
+   }
+
+   return ret;
 }
diff --git a/src/stubser/cfile_parser_worker_loc.h b/src/stubser/cfile_parser_worker_loc.h
index 5a7d1b4..0039580 100644
--- a/src/stubser/cfile_parser_worker_loc.h
+++ b/src/stubser/cfile_parser_worker_loc.h
@@ -14,8 +14,6 @@
 #ifndef STUBSER_CFILE_PARSER_WORKER_LOC_H_
 #define STUBSER_CFILE_PARSER_WORKER_LOC_H_
 
-typedef char* (*stringWorker)(char**, const regex_t *, const regex_t *, bool*, size_t*);
-
-char* cfile_expWorker(char **aInput, const regex_t *aStart, const regex_t *aEnd, bool *aActive, size_t *aSize);
+int8_t regExWorker(char **aOutput, char **aInput, const regex_t *aStart, const regex_t *aEnd, uint8_t *aBlockDepth, bool aMultiLevel);
 
 #endif /* STUBSER_CFILE_PARSER_WORKER_LOC_H_ */