Check if a string is hexadecimal

Question

I know the easiest way is using a regular expression, but I wonder if there are other ways to do this check.

Why do I need this? I am writing a Python script that re

Answer 1

Since all the regular expression above took about the same amount of time, I would guess that most of the time was related to converting the string to a regular expression. Below is the data I got when pre-compiling the regular expression.

int_hex  
0.000800 ms 10  
0.001300 ms 100  
0.008200 ms 1000  

all_hex  
0.003500 ms 10  
0.015200 ms 100  
0.112000 ms 1000  

fullmatch_hex  
0.001800 ms 10  
0.001200 ms 100  
0.005500 ms 1000