Question or problem about Python programming:
In Java, I could use the following function to check if a string is a valid regex (source):
boolean isRegex; try { Pattern.compile(input); isRegex = true; } catch (PatternSyntaxException e) { isRegex = false; }
Is there a Python equivalent of the Pattern.compile() and PatternSyntaxException? If so, what is it?
How to solve the problem:
Solution 1:
Similar to Java. Use re.error
exception:
import re try: re.compile('[') is_valid = True except re.error: is_valid = False
exception re.error
Exception raised when a string passed to one of the functions here is
not a valid regular expression (for example, it might contain
unmatched parentheses) or when some other error occurs during
compilation or matching. It is never an error if a string contains no
match for a pattern.
Solution 2:
Another fancy way to write the same answer:
import re try: print(bool(re.compile(input()))) except re.error: print('False')