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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"re.match appears to hang with certain combinations of pattern and string","articleBody":"BPO | [43686](https://bugs.python.org/issue43686)\n--- | :---\nNosy | @gpshead, @sweeneyde\nSuperseder | \u003cli\u003ebpo-1662581: the re module can perform poorly: O(2**n) versus O(n**2)\u003c/li\u003e\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = \u003cDate 2021-04-12.01:45:43.099\u003e\ncreated_at = \u003cDate 2021-04-01.03:11:36.212\u003e\nlabels = ['library', '3.9', 'performance']\ntitle = 're.match appears to hang with certain combinations of pattern and string'\nupdated_at = \u003cDate 2021-04-12.01:45:43.094\u003e\nuser = 'https://bugs.python.org/alegrigoriev'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2021-04-12.01:45:43.094\u003e\nactor = 'gregory.p.smith'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2021-04-12.01:45:43.099\u003e\ncloser = 'gregory.p.smith'\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2021-04-01.03:11:36.212\u003e\ncreator = 'alegrigoriev'\ndependencies = []\nfiles = []\nhgrepos = []\nissue_num = 43686\nkeywords = []\nmessage_count = 3.0\nmessages = ['389949', '389953', '390809']\nnosy_count = 3.0\nnosy_names = ['gregory.p.smith', 'Dennis Sweeney', 'alegrigoriev']\npr_nums = []\npriority = 'normal'\nresolution = 'duplicate'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = '1662581'\ntype = 'performance'\nurl = 'https://bugs.python.org/issue43686'\nversions = ['Python 3.9']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/alegrigoriev","@type":"Person","name":"alegrigoriev"},"datePublished":"2021-04-01T03:11:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/87852/cpython/issues/87852"}