# astropy__astropy-14365
# Loki Mode Multi-Agent Patch
# Attempts: 1

Based on the issue description and the architect's analysis, I need to generate a patch that makes the QDP command parsing case-insensitive. The issue is that regex patterns matching commands like `READ SERR`, `READ TERR`, `SKIP`, `NO NO NO` are case-sensitive but QDP itself is case-insensitive.

```
--- a/astropy/io/ascii/qdp.py
+++ b/astropy/io/ascii/qdp.py
@@ -68,7 +68,7 @@ def _line_type(line, delimiter=None):
     _decimal_re = r"[+-]?(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?"
     _command_re = r"READ [TS]ERR(\s+[0-9]+)+"
 
-    sep = delimiter
+    sep = delimiter
     if delimiter is None:
         sep = r"\s+"
     _new_re = rf"NO({sep}NO)+"
@@ -76,10 +76,10 @@ def _line_type(line, delimiter=None):
     _data_re = rf"({_decimal_re}|NO|[-+]?nan)({sep}({_decimal_re}|NO|[-+]?nan))*)"
     _type_re = rf"^\s*((?P<command>{_command_re})|(?P<new>{_new_re})|(?P<data>{_data_re})?\s*(\!(?P<comment>.*))?\s*$"
 
-    _line_type_re = re.compile(_type_re)
+    _line_type_re = re.compile(_type_re, re.IGNORECASE)
     line = line.strip()
     if not line:
         return ("comment", "")
-    match = _line_type_re.match(line)
+    match = _line_type_re.match(line)
 
     if match is None:
```

Let me provide a cleaner patch based on the standard pattern for this type of fix:

```
--- a/astropy/io/ascii/qdp.py
+++ b/astropy/io/ascii/qdp.py
@@ -63,7 +63,7 @@ def _line_type(line, delimiter=None):
     _type_re = rf"^\s*((?P<command>{_command_re})|(?P<new>{_new_re})|(?P<data>{_data_re})?\s*(\!(?P<comment>.*))?\s*$"
-    _line_type_re = re.compile(_type_re)
+    _line_type_re = re.compile(_type_re, re.IGNORECASE)
     line = line.strip()
```