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Document that builtins.match takes a POSIX extended RE

This commit is contained in:
Eelco Dolstra 2017-05-17 12:18:18 +02:00
parent e46090edb1
commit f134fc4cbe
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2 changed files with 13 additions and 4 deletions
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14
doc/manual/expressions/builtins.xml
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@ -213,10 +213,11 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
<varlistentry><term><function>builtins.match</function>
<replaceable>regex</replaceable> <replaceable>str</replaceable></term>
<listitem><para>Returns a list if
<replaceable>regex</replaceable> matches
<replaceable>str</replaceable> precisely, otherwise returns <literal>null</literal>.
Each item in the list is a regex group.
<listitem><para>Returns a list if the <link
xlink:href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04">extended
POSIX regular expression</link> <replaceable>regex</replaceable>
matches <replaceable>str</replaceable> precisely, otherwise returns
<literal>null</literal>. Each item in the list is a regex group.
<programlisting>
builtins.match "ab" "abc"
@ -236,6 +237,11 @@ builtins.match "a(b)(c)" "abc"
Evaluates to <literal>[ "b" "c" ]</literal>.
<programlisting>
builtins.match "[[:space:]]+([[:upper:]]+)[[:space:]]+" " FOO "
</programlisting>
Evaluates to <literal>[ "foo" ]</literal>.
</para></listitem>
</varlistentry>

3
tests/lang/eval-okay-regex-match.nix
View File

@ -17,8 +17,11 @@ assert matches "fo+" "foo";
assert matches "fo{1,2}" "foo";
assert !matches "fo{1,2}" "fooo";
assert !matches "fo*" "foobar";
assert matches "[[:space:]]+([^[:space:]]+)[[:space:]]+" " foo ";
assert !matches "[[:space:]]+([[:upper:]]+)[[:space:]]+" " foo ";
assert match "(.*)\\.nix" "foobar.nix" == [ "foobar" ];
assert match "[[:space:]]+([[:upper:]]+)[[:space:]]+" " FOO " == [ "FOO" ];
assert splitFN "/path/to/foobar.nix" == [ "/path/to/" "/path/to" "foobar" "nix" ];
assert splitFN "foobar.cc" == [ null null "foobar" "cc" ];