Enhance run function in experiment.py to correctly identify and handle bash process substitution syntax "<( cmd )" by using a regex that matches it only at the start of a statement or after whitespace, preventing false positives.

Author: Acribbs

cgatcore/experiment.py

@@ -1403,7 +1403,9 @@ def run(statement,
     # remove new lines
     statement = " ".join(re.sub("\t+", " ", statement).split("\n")).strip()
 
-    if "<(" in statement:
+    # Only wrap for real bash process substitution <( cmd ), not "<(" in paths/variables.
+    # Match "<(" at start of statement or after whitespace to avoid false positives.
+    if re.search(r'(^|\s)<\(', statement):
         shell = os.environ.get('SHELL', "/bin/bash")
         if "bash" not in shell:
             raise ValueError(