diff --git a/compiler/llstream.nim b/compiler/llstream.nim
index bfc377a16d988..865a98ee0d455 100644
--- a/compiler/llstream.nim
+++ b/compiler/llstream.nim
@@ -147,11 +147,11 @@ proc llStreamReadLine*(s: PLLStream, line: var string): bool =
   of llsString:
     while s.rd < s.s.len:
       case s.s[s.rd]
-      of '\x0D':
+      of '\r':
         inc(s.rd)
-        if s.s[s.rd] == '\x0A': inc(s.rd)
+        if s.s[s.rd] == '\n': inc(s.rd)
         break
-      of '\x0A':
+      of '\n':
         inc(s.rd)
         break
       else:
diff --git a/lib/packages/docutils/highlite.nim b/lib/packages/docutils/highlite.nim
index a1b47cd6e1e77..8c91e0a8ed596 100644
--- a/lib/packages/docutils/highlite.nim
+++ b/lib/packages/docutils/highlite.nim
@@ -103,7 +103,7 @@ proc initGeneralTokenizer*(g: var GeneralTokenizer, buf: cstring) =
   g.state = low(TokenClass)
   g.lang = low(SourceLanguage)
   var pos = 0                     # skip initial whitespace:
-  while g.buf[pos] in {' ', '\x09'..'\x0D'}: inc(pos)
+  while g.buf[pos] in {' ', '\t'..'\r'}: inc(pos)
   g.pos = pos
 
 proc initGeneralTokenizer*(g: var GeneralTokenizer, buf: string) =
@@ -194,7 +194,7 @@ proc nimNextToken(g: var GeneralTokenizer, keywords: openArray[string] = @[]) =
           g.state = gtNone
         else: inc(pos)
         break
-      of '\0', '\x0D', '\x0A':
+      of '\0', '\r', '\n':
         g.state = gtNone
         break
       of '\"':
@@ -204,9 +204,9 @@ proc nimNextToken(g: var GeneralTokenizer, keywords: openArray[string] = @[]) =
       else: inc(pos)
   else:
     case g.buf[pos]
-    of ' ', '\x09'..'\x0D':
+    of ' ', '\t'..'\r':
       g.kind = gtWhitespace
-      while g.buf[pos] in {' ', '\x09'..'\x0D'}: inc(pos)
+      while g.buf[pos] in {' ', '\t'..'\r'}: inc(pos)
     of '#':
       g.kind = gtComment
       inc(pos)
@@ -243,7 +243,7 @@ proc nimNextToken(g: var GeneralTokenizer, keywords: openArray[string] = @[]) =
           else:
             inc pos
       else:
-        while g.buf[pos] notin {'\0', '\x0A', '\x0D'}: inc(pos)
+        while g.buf[pos] notin {'\0', '\n', '\r'}: inc(pos)
     of 'a'..'z', 'A'..'Z', '_', '\x80'..'\xFF':
       var id = ""
       while g.buf[pos] in SymChars + {'_'}:
@@ -267,7 +267,7 @@ proc nimNextToken(g: var GeneralTokenizer, keywords: openArray[string] = @[]) =
         else:
           g.kind = gtRawData
           inc(pos)
-          while not (g.buf[pos] in {'\0', '\x0A', '\x0D'}):
+          while not (g.buf[pos] in {'\0', '\n', '\r'}):
             if g.buf[pos] == '"' and g.buf[pos+1] != '"': break
             inc(pos)
           if g.buf[pos] == '\"': inc(pos)
@@ -302,7 +302,7 @@ proc nimNextToken(g: var GeneralTokenizer, keywords: openArray[string] = @[]) =
       g.kind = gtCharLit
       while true:
         case g.buf[pos]
-        of '\0', '\x0D', '\x0A':
+        of '\0', '\r', '\n':
           break
         of '\'':
           inc(pos)
@@ -330,7 +330,7 @@ proc nimNextToken(g: var GeneralTokenizer, keywords: openArray[string] = @[]) =
         g.kind = gtStringLit
         while true:
           case g.buf[pos]
-          of '\0', '\x0D', '\x0A':
+          of '\0', '\r', '\n':
             break
           of '\"':
             inc(pos)
@@ -436,7 +436,7 @@ proc clikeNextToken(g: var GeneralTokenizer, keywords: openArray[string],
           g.state = gtNone
         else: inc(pos)
         break
-      of '\0', '\x0D', '\x0A':
+      of '\0', '\r', '\n':
         g.state = gtNone
         break
       of '\"':
@@ -446,14 +446,14 @@ proc clikeNextToken(g: var GeneralTokenizer, keywords: openArray[string],
       else: inc(pos)
   else:
     case g.buf[pos]
-    of ' ', '\x09'..'\x0D':
+    of ' ', '\t'..'\r':
       g.kind = gtWhitespace
-      while g.buf[pos] in {' ', '\x09'..'\x0D'}: inc(pos)
+      while g.buf[pos] in {' ', '\t'..'\r'}: inc(pos)
     of '/':
       inc(pos)
       if g.buf[pos] == '/':
         g.kind = gtComment
-        while not (g.buf[pos] in {'\0', '\x0A', '\x0D'}): inc(pos)
+        while not (g.buf[pos] in {'\0', '\n', '\r'}): inc(pos)
       elif g.buf[pos] == '*':
         g.kind = gtLongComment
         var nested = 0
@@ -593,9 +593,9 @@ proc javaNextToken(g: var GeneralTokenizer) =
 
 proc yamlPlainStrLit(g: var GeneralTokenizer, pos: var int) =
   g.kind = gtStringLit
-  while g.buf[pos] notin {'\0', '\x09'..'\x0D', ',', ']', '}'}:
+  while g.buf[pos] notin {'\0', '\t'..'\r', ',', ']', '}'}:
     if g.buf[pos] == ':' and
-        g.buf[pos + 1] in {'\0', '\x09'..'\x0D', ' '}:
+        g.buf[pos + 1] in {'\0', '\t'..'\r', ' '}:
       break
     inc(pos)
 
@@ -608,14 +608,14 @@ proc yamlPossibleNumber(g: var GeneralTokenizer, pos: var int) =
     while g.buf[pos] in {'0'..'9'}: inc(pos)
   else: yamlPlainStrLit(g, pos)
   if g.kind == gtNone:
-    if g.buf[pos] in {'\0', '\x09'..'\x0D', ' ', ',', ']', '}'}:
+    if g.buf[pos] in {'\0', '\t'..'\r', ' ', ',', ']', '}'}:
       g.kind = gtDecNumber
     elif g.buf[pos] == '.':
       inc(pos)
       if g.buf[pos] notin {'0'..'9'}: yamlPlainStrLit(g, pos)
       else:
         while g.buf[pos] in {'0'..'9'}: inc(pos)
-        if g.buf[pos] in {'\0', '\x09'..'\x0D', ' ', ',', ']', '}'}:
+        if g.buf[pos] in {'\0', '\t'..'\r', ' ', ',', ']', '}'}:
           g.kind = gtFloatNumber
     if g.kind == gtNone:
       if g.buf[pos] in {'e', 'E'}:
@@ -624,13 +624,13 @@ proc yamlPossibleNumber(g: var GeneralTokenizer, pos: var int) =
         if g.buf[pos] notin {'0'..'9'}: yamlPlainStrLit(g, pos)
         else:
           while g.buf[pos] in {'0'..'9'}: inc(pos)
-          if g.buf[pos] in {'\0', '\x09'..'\x0D', ' ', ',', ']', '}'}:
+          if g.buf[pos] in {'\0', '\t'..'\r', ' ', ',', ']', '}'}:
             g.kind = gtFloatNumber
           else: yamlPlainStrLit(g, pos)
       else: yamlPlainStrLit(g, pos)
-  while g.buf[pos] notin {'\0', ',', ']', '}', '\x0A', '\x0D'}:
+  while g.buf[pos] notin {'\0', ',', ']', '}', '\n', '\r'}:
     inc(pos)
-    if g.buf[pos] notin {'\x09'..'\x0D', ' ', ',', ']', '}'}:
+    if g.buf[pos] notin {'\t'..'\r', ' ', ',', ']', '}'}:
       yamlPlainStrLit(g, pos)
       break
   # theoretically, we would need to parse indentation (like with block scalars)
@@ -699,13 +699,13 @@ proc yamlNextToken(g: var GeneralTokenizer) =
       while g.buf[pos] in {' ', '\t'}: inc(pos)
     of '#':
       g.kind = gtComment
-      while g.buf[pos] notin {'\0', '\x0A', '\x0D'}: inc(pos)
-    of '\x0A', '\x0D': discard
+      while g.buf[pos] notin {'\0', '\n', '\r'}: inc(pos)
+    of '\n', '\r': discard
     else:
       # illegal here. just don't parse a block scalar
       g.kind = gtNone
       g.state = gtOther
-    if g.buf[pos] in {'\x0A', '\x0D'} and g.state == gtCommand:
+    if g.buf[pos] in {'\n', '\r'} and g.state == gtCommand:
       g.state = gtLongStringLit
   elif g.state == gtLongStringLit:
     # beware, this is the only token where we actually have to parse
@@ -714,10 +714,10 @@ proc yamlNextToken(g: var GeneralTokenizer) =
     g.kind = gtLongStringLit
     # first, we have to find the parent indentation of the block scalar, so that
     # we know when to stop
-    assert g.buf[pos] in {'\x0A', '\x0D'}
+    assert g.buf[pos] in {'\n', '\r'}
     var lookbehind = pos - 1
     var headerStart = -1
-    while lookbehind >= 0 and g.buf[lookbehind] notin {'\x0A', '\x0D'}:
+    while lookbehind >= 0 and g.buf[lookbehind] notin {'\n', '\r'}:
       if headerStart == -1 and g.buf[lookbehind] in {'|', '>'}:
         headerStart = lookbehind
       dec(lookbehind)
@@ -728,12 +728,12 @@ proc yamlNextToken(g: var GeneralTokenizer) =
       # when the header is alone in a line, this line does not show the parent's
       # indentation, so we must go further. search the first previous line with
       # non-whitespace content.
-      while lookbehind >= 0 and g.buf[lookbehind] in {'\x0A', '\x0D'}:
+      while lookbehind >= 0 and g.buf[lookbehind] in {'\n', '\r'}:
         dec(lookbehind)
         while lookbehind >= 0 and
             g.buf[lookbehind] in {' ', '\t'}: dec(lookbehind)
       # now, find the beginning of the line...
-      while lookbehind >= 0 and g.buf[lookbehind] notin {'\x0A', '\x0D'}:
+      while lookbehind >= 0 and g.buf[lookbehind] notin {'\n', '\r'}:
         dec(lookbehind)
       # ... and its indentation
       indentation = 1
@@ -741,7 +741,7 @@ proc yamlNextToken(g: var GeneralTokenizer) =
     if lookbehind == -1: indentation = 0 # top level
     elif g.buf[lookbehind + 1] == '-' and g.buf[lookbehind + 2] == '-' and
         g.buf[lookbehind + 3] == '-' and
-        g.buf[lookbehind + 4] in {'\x09'..'\x0D', ' '}:
+        g.buf[lookbehind + 4] in {'\t'..'\r', ' '}:
       # this is a document start, therefore, we are at top level
       indentation = 0
     # because lookbehind was at newline char when calculating indentation, we're
@@ -749,7 +749,7 @@ proc yamlNextToken(g: var GeneralTokenizer) =
     let parentIndentation = indentation - 1
 
     # find first content
-    while g.buf[pos] in {' ', '\x0A', '\x0D'}:
+    while g.buf[pos] in {' ', '\n', '\r'}:
       if g.buf[pos] == ' ': inc(indentation)
       else: indentation = 0
       inc(pos)
@@ -766,12 +766,12 @@ proc yamlNextToken(g: var GeneralTokenizer) =
       if (indentation < minIndentation and g.buf[pos] == '#') or
           (indentation == 0 and g.buf[pos] == '.' and g.buf[pos + 1] == '.' and
           g.buf[pos + 2] == '.' and
-          g.buf[pos + 3] in {'\0', '\x09'..'\x0D', ' '}):
+          g.buf[pos + 3] in {'\0', '\t'..'\r', ' '}):
         # comment after end of block scalar, or end of document
         break
       minIndentation = min(indentation, minIndentation)
-      while g.buf[pos] notin {'\0', '\x0A', '\x0D'}: inc(pos)
-      while g.buf[pos] in {' ', '\x0A', '\x0D'}:
+      while g.buf[pos] notin {'\0', '\n', '\r'}: inc(pos)
+      while g.buf[pos] in {' ', '\n', '\r'}:
         if g.buf[pos] == ' ': inc(indentation)
         else: indentation = 0
         inc(pos)
@@ -780,27 +780,27 @@ proc yamlNextToken(g: var GeneralTokenizer) =
   elif g.state == gtOther:
     # gtOther means 'inside YAML document'
     case g.buf[pos]
-    of ' ', '\x09'..'\x0D':
+    of ' ', '\t'..'\r':
       g.kind = gtWhitespace
-      while g.buf[pos] in {' ', '\x09'..'\x0D'}: inc(pos)
+      while g.buf[pos] in {' ', '\t'..'\r'}: inc(pos)
     of '#':
       g.kind = gtComment
       inc(pos)
-      while g.buf[pos] notin {'\0', '\x0A', '\x0D'}: inc(pos)
+      while g.buf[pos] notin {'\0', '\n', '\r'}: inc(pos)
     of '-':
       inc(pos)
-      if g.buf[pos] in {'\0', ' ', '\x09'..'\x0D'}:
+      if g.buf[pos] in {'\0', ' ', '\t'..'\r'}:
         g.kind = gtPunctuation
       elif g.buf[pos] == '-' and
-          (pos == 1 or g.buf[pos - 2] in {'\x0A', '\x0D'}): # start of line
+          (pos == 1 or g.buf[pos - 2] in {'\n', '\r'}): # start of line
         inc(pos)
-        if g.buf[pos] == '-' and g.buf[pos + 1] in {'\0', '\x09'..'\x0D', ' '}:
+        if g.buf[pos] == '-' and g.buf[pos + 1] in {'\0', '\t'..'\r', ' '}:
           inc(pos)
           g.kind = gtKeyword
         else: yamlPossibleNumber(g, pos)
       else: yamlPossibleNumber(g, pos)
     of '.':
-      if pos == 0 or g.buf[pos - 1] in {'\x0A', '\x0D'}:
+      if pos == 0 or g.buf[pos - 1] in {'\n', '\r'}:
         inc(pos)
         for i in 1..2:
           if g.buf[pos] != '.': break
@@ -812,12 +812,12 @@ proc yamlNextToken(g: var GeneralTokenizer) =
       else: yamlPlainStrLit(g, pos)
     of '?':
       inc(pos)
-      if g.buf[pos] in {'\0', ' ', '\x09'..'\x0D'}:
+      if g.buf[pos] in {'\0', ' ', '\t'..'\r'}:
         g.kind = gtPunctuation
       else: yamlPlainStrLit(g, pos)
     of ':':
       inc(pos)
-      if g.buf[pos] in {'\0', '\x09'..'\x0D', ' ', '\'', '\"'} or
+      if g.buf[pos] in {'\0', '\t'..'\r', ' ', '\'', '\"'} or
           (pos > 0 and g.buf[pos - 2] in {'}', ']', '\"', '\''}):
         g.kind = gtPunctuation
       else: yamlPlainStrLit(g, pos)
@@ -836,7 +836,7 @@ proc yamlNextToken(g: var GeneralTokenizer) =
       inc(pos)
       if g.buf[pos] == '<':
         # literal tag (e.g. `!<tag:yaml.org,2002:str>`)
-        while g.buf[pos] notin {'\0', '>', '\x09'..'\x0D', ' '}: inc(pos)
+        while g.buf[pos] notin {'\0', '>', '\t'..'\r', ' '}: inc(pos)
         if g.buf[pos] == '>': inc(pos)
       else:
         while g.buf[pos] in {'A'..'Z', 'a'..'z', '0'..'9', '-'}: inc(pos)
@@ -845,17 +845,17 @@ proc yamlNextToken(g: var GeneralTokenizer) =
           # prefixed tag (e.g. `!!str`)
           inc(pos)
           while g.buf[pos] notin
-              {'\0', '\x09'..'\x0D', ' ', ',', '[', ']', '{', '}'}: inc(pos)
-        of '\0', '\x09'..'\x0D', ' ': discard
+              {'\0', '\t'..'\r', ' ', ',', '[', ']', '{', '}'}: inc(pos)
+        of '\0', '\t'..'\r', ' ': discard
         else:
           # local tag (e.g. `!nim:system:int`)
-          while g.buf[pos] notin {'\0', '\x09'..'\x0D', ' '}: inc(pos)
+          while g.buf[pos] notin {'\0', '\t'..'\r', ' '}: inc(pos)
     of '&':
       g.kind = gtLabel
-      while g.buf[pos] notin {'\0', '\x09'..'\x0D', ' '}: inc(pos)
+      while g.buf[pos] notin {'\0', '\t'..'\r', ' '}: inc(pos)
     of '*':
       g.kind = gtReference
-      while g.buf[pos] notin {'\0', '\x09'..'\x0D', ' '}: inc(pos)
+      while g.buf[pos] notin {'\0', '\t'..'\r', ' '}: inc(pos)
     of '|', '>':
       # this can lead to incorrect tokenization when | or > appear inside flow
       # content. checking whether we're inside flow content is not
@@ -871,18 +871,18 @@ proc yamlNextToken(g: var GeneralTokenizer) =
     # outside document
     case g.buf[pos]
     of '%':
-      if pos == 0 or g.buf[pos - 1] in {'\x0A', '\x0D'}:
+      if pos == 0 or g.buf[pos - 1] in {'\n', '\r'}:
         g.kind = gtDirective
-        while g.buf[pos] notin {'\0', '\x0A', '\x0D'}: inc(pos)
+        while g.buf[pos] notin {'\0', '\n', '\r'}: inc(pos)
       else:
         g.state = gtOther
         yamlPlainStrLit(g, pos)
-    of ' ', '\x09'..'\x0D':
+    of ' ', '\t'..'\r':
       g.kind = gtWhitespace
-      while g.buf[pos] in {' ', '\x09'..'\x0D'}: inc(pos)
+      while g.buf[pos] in {' ', '\t'..'\r'}: inc(pos)
     of '#':
       g.kind = gtComment
-      while g.buf[pos] notin {'\0', '\x0A', '\x0D'}: inc(pos)
+      while g.buf[pos] notin {'\0', '\n', '\r'}: inc(pos)
     of '\0': g.kind = gtEof
     else:
       g.kind = gtNone
diff --git a/lib/packages/docutils/rst.nim b/lib/packages/docutils/rst.nim
index 83e3ef6ffecbf..61b17bed18f60 100644
--- a/lib/packages/docutils/rst.nim
+++ b/lib/packages/docutils/rst.nim
@@ -311,27 +311,27 @@ proc getBracket(L: var Lexer, tok: var Token) =
 proc getIndentAux(L: var Lexer, start: int): int =
   var pos = start
   # skip the newline (but include it in the token!)
-  if L.buf[pos] == '\x0D':
-    if L.buf[pos + 1] == '\x0A': inc pos, 2
+  if L.buf[pos] == '\r':
+    if L.buf[pos + 1] == '\n': inc pos, 2
     else: inc pos
-  elif L.buf[pos] == '\x0A':
+  elif L.buf[pos] == '\n':
     inc pos
   if L.skipPounds:
     if L.buf[pos] == '#': inc pos
     if L.buf[pos] == '#': inc pos
   while true:
     case L.buf[pos]
-    of ' ', '\x0B', '\x0C':
+    of ' ', '\v', '\f':
       inc pos
       inc result
-    of '\x09':
+    of '\t':
       inc pos
       result = result - (result mod 8) + 8
     else:
       break                   # EndOfFile also leaves the loop
   if L.buf[pos] == '\0':
     result = 0
-  elif L.buf[pos] == '\x0A' or L.buf[pos] == '\x0D':
+  elif L.buf[pos] == '\n' or L.buf[pos] == '\r':
     # look at the next line for proper indentation:
     result = getIndentAux(L, pos)
   L.bufpos = pos              # no need to set back buf
@@ -355,12 +355,12 @@ proc rawGetTok(L: var Lexer, tok: var Token) =
   case c
   of 'a'..'z', 'A'..'Z', '\x80'..'\xFF', '0'..'9':
     getThing(L, tok, SymChars)
-  of ' ', '\x09', '\x0B', '\x0C':
-    getThing(L, tok, {' ', '\x09'})
+  of ' ', '\t', '\v', '\f':
+    getThing(L, tok, {' ', '\t'})
     tok.kind = tkWhite
-    if L.buf[L.bufpos] in {'\x0D', '\x0A'}:
+    if L.buf[L.bufpos] in {'\r', '\n'}:
       rawGetTok(L, tok)       # ignore spaces before \n
-  of '\x0D', '\x0A':
+  of '\r', '\n':
     getIndent(L, tok)
     L.adornmentLine = false
   of '!', '\"', '#', '$', '%', '&', '\'',  '*', '+', ',', '-', '.',
@@ -1769,7 +1769,7 @@ proc parseSimpleTable(p: var RstParser): PRstNode =
       if currentTok(p).kind == tkIndent: inc p.idx
       if tokEnd(p) <= cols[0]: break
       if currentTok(p).kind in {tkEof, tkAdornment}: break
-      for j in countup(1, high(row)): row[j].add('\x0A')
+      for j in countup(1, high(row)): row[j].add('\n')
     a = newRstNode(rnTableRow)
     for j in countup(0, high(row)):
       initParser(q, p.s)
diff --git a/lib/pure/terminal.nim b/lib/pure/terminal.nim
index 03504b2bcf4ad..87dc06fe9366b 100644
--- a/lib/pure/terminal.nim
+++ b/lib/pure/terminal.nim
@@ -48,8 +48,8 @@ proc getTerminal(): PTerminal {.inline.} =
   result = gTerm
 
 const
-  fgPrefix = "\x1b[38;2;"
-  bgPrefix = "\x1b[48;2;"
+  fgPrefix = "\e[38;2;"
+  bgPrefix = "\e[48;2;"
   ansiResetCode* = "\e[0m"
   stylePrefix = "\e["
 
diff --git a/lib/system/io.nim b/lib/system/io.nim
index 9ecf817bc9652..31768eb388c86 100644
--- a/lib/system/io.nim
+++ b/lib/system/io.nim
@@ -918,7 +918,7 @@ iterator lines*(filename: string): string {.tags: [ReadIOEffect].} =
   ##   proc transformLetters(filename: string) =
   ##     var buffer = ""
   ##     for line in filename.lines:
-  ##       buffer.add(line.replace("a", "0") & '\x0A')
+  ##       buffer.add(line.replace("a", "0") & '\n')
   ##     writeFile(filename, buffer)
   var f = open(filename, bufSize=8000)
   try: