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How to use special characters in Python Regular Expression?
From Python documentation
Non-special characters match themselves. Special characters don't match themselves −
| \ | Escape special char or start a sequence. |
| . | Match any char except newline, see re.DOTALL |
| ^ | Match start of the string, see re.MULTILINE |
| $ | Match end of the string, see re.MULTILINE |
| [ ] | Enclose a set of matchable chars |
| R|S | Match either regex R or regex S. |
| () | Create capture group, & indicate precedence |
After '[', enclose a set, the only special chars are −
| ] | End the set, if not the 1st char |
| - | A range, eg. a-c matches a, b or c |
| ^ | Negate the set only if it is the 1st char |
Quantifiers (append '?' for non-greedy) −
| {m} | Exactly m repetitions |
| {m,n} | From m (default 0) to n (default infinity) |
| * | 0 or more. Same as {,} |
| + | 1 or more. Same as {1,} |
| ? | 0 or 1. Same as {,1} |
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