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diff --git a/unit-tests/test/script/regex/driver.cxx b/unit-tests/test/script/regex/driver.cxx
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+// file      : unit-tests/test/script/regex/driver.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <regex>
+#include <type_traits> // is_pod, is_array
+
+#include <build2/test/script/regex>
+
+using namespace std;
+using namespace build2::test::script::regex;
+
+int
+main ()
+{
+  using lc = line_char;
+  using ls = line_string;
+  using lr = line_regex;
+
+  // Test line_char.
+  //
+  {
+    static_assert (is_pod<lc>::value && !is_array<lc>::value,
+                   "line_char must be char-like");
+
+    // Zero-initialed line_char should be the null-char as required by
+    // char_traits<>::length() specification.
+    //
+    assert (lc () == lc::nul);
+
+    line_pool p;
+
+    assert (lc::eof == -1);
+    assert (lc::nul == 0);
+
+    enum meta {mn = 'n', mp = 'p'};
+
+    // Special comparison.
+    //
+    assert (lc ('0') == lc ('0'));
+    assert (lc ('0') == '0');
+    assert (lc ('n') == mn);
+    assert (mn              == static_cast<meta> (lc ('n')));
+
+    assert (lc ('0') != lc ('1'));
+    assert (lc ('0') != '1');
+    assert (lc ('n') != mp);
+    assert (lc ('0') != lc ("0", p));
+    assert (lc ('0') != lc (regex ("0"), p));
+
+    assert (lc ('0') < lc ('1'));
+    assert (lc ('0') < '1');
+    assert (lc ('1') < lc ("0", p));
+    assert (lc ('n') < mp);
+
+    assert (lc ('0') <= '1');
+    assert (lc ('0') <= lc ('1'));
+    assert (lc ('n') <= mn);
+    assert (lc ('1') <= lc ("0", p));
+
+    // Literal comparison.
+    //
+    assert (lc ("a", p)         == lc ("a", p));
+    assert (lc ("a", p).literal == lc ("a", p).literal);
+    assert (char (lc ("a", p))  == '\a');
+
+    assert (lc ("a", p)   != lc ("b", p));
+    assert (!(lc ("a", p) != lc (regex ("a"), p))); // Matches.
+    assert (lc ("a", p)   != lc (regex ("b"), p));
+
+    assert (lc ("a", p)   < lc ("b", p));
+    assert (!(lc ("a", p) < lc (regex ("a"), p))); // Matches.
+
+    assert (lc ("a", p) <= lc ("b", p));
+    assert (lc ("a", p) <= lc (regex ("a"), p));
+    assert (lc ("a", p) <  lc (regex ("c"), p));
+
+    // Regex comparison.
+    //
+    assert (lc ("a", p)           == lc (regex ("a|b"), p));
+    assert (lc (regex ("a|b"), p) == lc ("a", p));
+  }
+
+  // Test char_traits<line_char>.
+  //
+  {
+    using ct = char_traits<lc>;
+    using vc = vector<lc>;
+
+    lc c;
+    ct::assign (c, '0');
+    assert (c == ct::char_type ('0'));
+
+    assert (ct::to_char_type (c) == c);
+    assert (ct::to_int_type (c) == c);
+
+    assert (ct::eq_int_type (c, c));
+    assert (!ct::eq_int_type (c, lc::eof));
+
+    assert (ct::eof () == lc::eof);
+
+    assert (ct::not_eof (c) == c);
+    assert (ct::not_eof (lc::eof) != lc::eof);
+
+    ct::assign (&c, 1, '1');
+    assert (c == ct::int_type ('1'));
+
+    assert (ct::eq (lc ('0'), lc ('0')));
+    assert (ct::lt (lc ('0'), lc ('1')));
+
+    vc v1 ({'0', '1', '2'});
+    vc v2 (3, lc::nul);
+
+    assert (ct::find (v1.data (), 3, '1') == v1.data () + 1);
+
+    ct::copy (v2.data (), v1.data (), 3);
+    assert (v2 == v1);
+
+    v2.push_back (lc::nul);
+    assert (ct::length (v2.data ()) == 3);
+
+    // Overlaping ranges.
+    //
+    ct::move (v1.data () + 1, v1.data (), 2);
+    assert (v1 == vc ({'0', '0', '1'}));
+
+    v1 = vc ({'0', '1', '2'});
+    ct::move (v1.data (), v1.data () + 1, 2);
+    assert (v1 == vc ({'1', '2', '2'}));
+  }
+
+  // Test line_char_locale and ctype<line_char> (only non-trivial functions).
+  //
+  {
+    using ct = ctype<lc>;
+
+    line_char_locale l;
+    assert (has_facet<ct> (l));
+
+    // It is better not to create q facet on stack as it is
+    // reference-countable.
+    //
+    const ct& t (use_facet<ct> (l));
+    line_pool p;
+
+    assert (t.is (ct::digit, '0'));
+    assert (!t.is (ct::digit, '?'));
+    assert (!t.is (ct::digit, lc ("0", p)));
+
+    const lc chars[] = { '0', '?' };
+    ct::mask m[2];
+
+    const lc* b (chars);
+    const lc* e (chars + 2);
+
+    // Cast flag value to mask type and compare to mask.
+    //
+    auto fl = [] (ct::mask m, ct::mask f) {return m == f;};
+
+    t.is (b, e, m);
+    assert (fl (m[0], ct::digit) && fl (m[1], 0));
+
+    assert (t.scan_is (ct::digit, b, e) == b);
+    assert (t.scan_is (0, b, e) == b + 1);
+
+    assert (t.scan_not (ct::digit, b, e) == b + 1);
+    assert (t.scan_not (0, b, e) == b);
+
+    {
+      char nr[] = "0?";
+      lc wd[2];
+      t.widen (nr, nr + 2, wd);
+      assert (wd[0] == b[0] && wd[1] == b[1]);
+    }
+
+    {
+      lc wd[] = {'0', lc ("a", p)};
+      char nr[2];
+      t.narrow (wd, wd + 2, '-', nr);
+      assert (nr[0] == '0' && nr[1] == '-');
+    }
+  }
+
+  // Test regex_traits<line_char>. Functions other that value() are trivial.
+  //
+  {
+    regex_traits<lc> t;
+
+    const int  radix[] = {8, 10}; // Radix 16 is not supported by line_char.
+    const char digits[] = "0123456789ABCDEF";
+
+    for (size_t r (0); r < 2; ++r)
+    {
+      for (int i (0); i < radix[r]; ++i)
+        assert (t.value (digits[i], radix[r]) == i);
+    }
+  }
+
+  // Test line_regex construction.
+  //
+  {
+    line_pool p;
+    lr r1 ({lc ("foo", p), lc (regex ("ba(r|z)"), p)}, move (p));
+
+    lr r2 (move (r1));
+    assert (regex_match (ls ({lc ("foo", r2.pool), lc ("bar", r2.pool)}), r2));
+    assert (!regex_match (ls ({lc ("foo", r2.pool), lc ("ba", r2.pool)}), r2));
+  }
+
+  // Test line_regex match.
+  //
+  {
+    line_pool p;
+
+    const lc foo ("foo", p);
+    const lc bar ("bar", p);
+    const lc baz ("baz", p);
+    const lc blank ("", p);
+
+    assert (regex_match  (ls ({foo, bar}), lr ({foo, bar})));
+    assert (!regex_match (ls ({foo, baz}), lr ({foo, bar})));
+
+    assert (regex_match (ls ({bar, foo}),
+                         lr ({'(', foo, '|', bar, ')', '+'})));
+
+    assert (regex_match (ls ({foo, foo}), lr ({'(', foo, ')', '\\', '1'})));
+
+    assert (regex_match (ls ({foo}),   lr ({lc (regex ("fo+"), p)})));
+    assert (regex_match (ls ({foo}),   lr ({lc (regex (".*"), p)})));
+    assert (regex_match (ls ({blank}), lr ({lc (regex (".*"), p)})));
+
+    assert (regex_match (ls ({blank, blank, foo}),
+                         lr ({blank, '*', foo, blank, '*'})));
+
+    assert (regex_match (ls ({blank, blank, foo}), lr ({'.', '*'})));
+
+    assert (regex_match (ls ({blank, blank}),
+                         lr ({blank, '*', foo, '?', blank, '*'})));
+
+    assert (regex_match  (ls ({foo}),      lr ({foo, '{', '1', '}'})));
+    assert (regex_match  (ls ({foo, foo}), lr ({foo, '{', '1', ',', '}'})));
+
+    assert (regex_match  (ls ({foo, foo}),
+                          lr ({foo, '{', '1', ',', '2', '}'})));
+
+    assert (!regex_match (ls ({foo, foo}),
+                          lr ({foo, '{', '3', ',', '4', '}'})));
+
+    assert (regex_match  (ls ({foo}), lr ({'(', '?', '=', foo, ')', foo})));
+    assert (regex_match  (ls ({foo}), lr ({'(', '?', '!', bar, ')', foo})));
+  }
+}