BugFix: gstlal_ll_inj_stream regex fix

gstlal-ugly/bin/gstlal_ll_inj_stream

@@ -58,7 +58,7 @@ def parse_command_line():
 	# add frame cache/injection options
 	parser.add_option("--inj-channel", metavar = "channel_name", action = "append", type = "str", help = "Full channel name of noiseless injection channel to be added to hoft. Can only be provided once per ifo.")
 	parser.add_option("--inj-frame-cache", metavar = "path", help = "Path to frame cache which points at noiseless injection frames")
-	parser.add_option("--inj-frame-cache-regex", metavar = "inj regex", type = "str", help = "Regex option to use with injection frame cache. Example: H1")
+	parser.add_option("--inj-frame-cache-regex", metavar = "inj regex", type = "str", help = "Regex option to use with injection frame cache. Must match the frame cache descriptor exactly. Example: H (instead of H1)")
 
 	# Add general options
 	parser.add_option("--output-dir", metavar = "path", action = "append", help = "Path to directory where frames should be written. Must be given once per ifo for which channels are provided as {IFO}=/path/to/directory.")
@@ -251,7 +251,7 @@ with tempfile.NamedTemporaryFile(mode='w',suffix='.cache') as f:
 		# fetch inj channel from disk
 		#
 
-		inj_src = pipeparts.mklalcachesrc(pipeline, location=f.name, cache_src_regex=options.inj_frame_cache_regex[0])
+		inj_src = pipeparts.mklalcachesrc(pipeline, location=f.name, cache_src_regex=options.inj_frame_cache_regex)
 		inj_demux = pipeparts.mkframecppchanneldemux(pipeline, inj_src, do_file_checksum=False, channel_list=list(map("%s:%s".__mod__, hoft_inj_channel_dict.items())))
 
 		# allow frame reading and decoding to occur in a diffrent