# Here the value of s3 is '(a)_(b)'.
#
# There are special functions and values:
-# $_ESCAPE is a function which will escape some characters with '\'.
+# @_ESCAPE is a function which will escape some characters with '\'.
# $0 - the text to be escaped
# $1 - the regexp which specifies which characters should be escaped
# if not specified then a default regexp is used
-# $_URL_ENCODE is a function which will perform percent-encoding
+# @_URL_ENCODE is a function which will perform percent-encoding
# $0 - the text to be encoded
# $1 - the regexp which specifies which characters should be encoded
# if not specified then a default regexp is used
-# $_SPRINTF is a call to the Perl sprintf() function
+# @_SPRINTF is a call to the Perl sprintf() function
# $0 - the format string
# $1 and continuing - the parameters to sprintf()
-# $_PATH is a function which will join a path from segments
+# @_PATH is a function which will join a path from segments
# $0 and continuing - the segments to be joined
# $_PATH_SEPATATOR is the path separator used by $_PATH.
# can be overwritten, default value '/'.
# $_REPLACE_LINE is the pattern to look for in files, to replace the
# entire line. Can be overwritten. Default value '###$0:'
# $0 - the name of the setting
-# $REPLACE_KEYWORD is the pattern to look for in files, to replace
+# $_REPLACE_KEYWORD is the pattern to look for in files, to replace
# just the pattern. Can be overwritten. Default value '###$0;'
# $0 - the name of the setting
# More functions and values can be added in future versions.