diff --git a/include/boost/regex/icu.hpp b/include/boost/regex/icu.hpp
index 059b7b16..53941b64 100644
--- a/include/boost/regex/icu.hpp
+++ b/include/boost/regex/icu.hpp
@@ -277,8 +277,8 @@ inline u32regex do_make_u32regex(InputIterator i,
    conv_type a(i), b(j);
    while(a != b)
    {
-	   v.push_back(*a);
-	   ++a;
+      v.push_back(*a);
+      ++a;
    }
    if(v.size())
       return u32regex(&*v.begin(), v.size(), opt);
@@ -297,8 +297,8 @@ inline u32regex do_make_u32regex(InputIterator i,
    conv_type a(i), b(j);
    while(a != b)
    {
-	   v.push_back(*a);
-	   ++a;
+      v.push_back(*a);
+      ++a;
    }
    if(v.size())
       return u32regex(&*v.begin(), v.size(), opt);
@@ -315,8 +315,8 @@ inline u32regex do_make_u32regex(InputIterator i,
    vector_type v;
    while(i != j)
    {
-	   v.push_back((UCHAR32)(*i));
-	   ++a;
+      v.push_back((UCHAR32)(*i));
+      ++a;
    }
    if(v.size())
       return u32regex(&*v.begin(), v.size(), opt);
@@ -880,7 +880,7 @@ inline OutputIterator u32regex_replace(OutputIterator out,
 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
    <OutputIterator>
 #endif
-	 (
+    (
       re_detail::do_regex_replace(
          re_detail::make_utf32_out(out, static_cast<mpl::int_<sizeof(*first)> const*>(0)),
          re_detail::make_utf32_seq(first, last, static_cast<mpl::int_<sizeof(*first)> const*>(0)),
@@ -902,7 +902,7 @@ inline OutputIterator u32regex_replace(OutputIterator out,
 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
    <OutputIterator>
 #endif
-	 (
+    (
       re_detail::do_regex_replace(
          re_detail::make_utf32_out(out, static_cast<mpl::int_<sizeof(*first)> const*>(0)),
          re_detail::make_utf32_seq(first, last, static_cast<mpl::int_<sizeof(*first)> const*>(0)),
@@ -924,7 +924,7 @@ inline OutputIterator u32regex_replace(OutputIterator out,
 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
    <OutputIterator>
 #endif
-	(
+   (
       re_detail::do_regex_replace(
          re_detail::make_utf32_out(out, static_cast<mpl::int_<sizeof(*first)> const*>(0)),
          re_detail::make_utf32_seq(first, last, static_cast<mpl::int_<sizeof(*first)> const*>(0)),
diff --git a/include/boost/regex/v4/basic_regex_creator.hpp b/include/boost/regex/v4/basic_regex_creator.hpp
index 22a23775..a03c9520 100644
--- a/include/boost/regex/v4/basic_regex_creator.hpp
+++ b/include/boost/regex/v4/basic_regex_creator.hpp
@@ -1185,7 +1185,7 @@ bool basic_regex_creator<charT, traits>::is_bad_repeat(re_syntax_base* pt)
          unsigned id = static_cast<re_repeat*>(pt)->id;
          if(id > sizeof(m_bad_repeats) * CHAR_BIT)
             return true;  // run out of bits, assume we can't traverse this one.
-		   static const boost::uintmax_t one = 1uL;
+         static const boost::uintmax_t one = 1uL;
          return m_bad_repeats & (one << id);
       }
    default:
@@ -1205,7 +1205,7 @@ void basic_regex_creator<charT, traits>::set_bad_repeat(re_syntax_base* pt)
    case syntax_element_long_set_rep:
       {
          unsigned id = static_cast<re_repeat*>(pt)->id;
-		   static const boost::uintmax_t one = 1uL;
+         static const boost::uintmax_t one = 1uL;
          if(id <= sizeof(m_bad_repeats) * CHAR_BIT)
             m_bad_repeats |= (one << id);
       }
diff --git a/include/boost/regex/v4/basic_regex_parser.hpp b/include/boost/regex/v4/basic_regex_parser.hpp
index 50102751..ad77d054 100644
--- a/include/boost/regex/v4/basic_regex_parser.hpp
+++ b/include/boost/regex/v4/basic_regex_parser.hpp
@@ -1220,17 +1220,17 @@ void basic_regex_parser<charT, traits>::parse_set_literal(basic_char_set<charT,
          char_set.add_range(start_range, end_range);
          if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_dash)
          {
-			   if(m_end == ++m_position)
-			   {
-				   fail(regex_constants::error_brack, m_position - m_base);
-				   return;
-			   }
-			   if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_close_set)
-			   {
+            if(m_end == ++m_position)
+            {
+               fail(regex_constants::error_brack, m_position - m_base);
+               return;
+            }
+            if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_close_set)
+            {
                // trailing - :
                --m_position;
                return;
-			   }
+            }
             fail(regex_constants::error_range, m_position - m_base);
             return;
          }