Regex match any setence containing ^ except those that start with \
Solution 1:
You can use
import re
texts = [r'foo^2', r'\foo^2']
for text in texts:
print(re.sub(r'(?<!\\)((?:\\\\)*\b\w+)\^(\w+)', r'$\1^\2$', text))
See the Python demo.
| Output: |
|---|
$foo^2$ |
\foo^2 |
See the regex demo. Details:
-
(?<!\\)- a location not immediately preceded with aa\char -
((?:\\\\)*\b\w+)- Group 1: zero or more\\string occurrences, a word boundary and one or more word chars -
\^- a^char -
(\w+)- Group 2: one or more word chars.