(usage): Specify that nl uses _basic_ regular expressions.

diff --git a/src/nl.c b/src/nl.c
index cc4865ef48f1fbce58d3314e6aaee94720377334..648e36e0a7ec34540227dc5c6ac5233eaff550c2 100644 (file)
--- a/src/nl.c
+++ b/src/nl.c
@@ -215,7 +215,8 @@ second character implies :.  Type \\\\ for \\.  STYLE is one of:\n\
   a         number all lines\n\
   t         number only nonempty lines\n\
   n         number no lines\n\
-  pREGEXP   number only lines that contain a match for REGEXP\n\
+  pBRE      number only lines that contain a match for the basic regular\n\
+              expression, BRE\n\
 \n\
 FORMAT is one of:\n\
 \n\