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authorChristian Neukirchen <chneukirchen@gmail.com>2016-02-10 19:02:45 +0100
committerChristian Neukirchen <chneukirchen@gmail.com>2016-02-10 19:02:45 +0100
commit95d82b1fd953a01bc8dadd0c277b79de17b64797 (patch)
treeb05216467166250fb017b9fc85ffc67f5d3214df /README.md
parentcd7fa86f76bbcdde6bc96a238ad2db7f007fc586 (diff)
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allow environment variables in place of string literals
avoids quoting... numeric values are safe to expand inline already.
Diffstat (limited to 'README.md')
-rw-r--r--README.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/README.md b/README.md
index 1be1677..7057611 100644
--- a/README.md
+++ b/README.md
@@ -171,6 +171,7 @@ Default: `n`.
 	             | =~~               -- case insensitive POSIX Extended Regular Expressions
 	
 	<str>      ::= " ([^"] | "")+ "  -- use "" for a single " inside "
+	             | $[A-Za-z0-9_]     -- environment variable
 
 	<typetest> ::= type ( == | = | != ) ( b | c | d | p | f | l )