Unverified50% confidenceFactExact time
nl -b p'pattern' numbers only the lines matching that regular expression pattern; unmatched lines are still output but without line numbers.
1
Sources
50%
Confidence
Long-term
Relevance
9/16/2026
First Seen
Sources
Related Entities
Related Claims
Unverifiedre.match() only attempts to match a pattern starting from the beginning of the string but does not require the match to reach the end of the string, effectively performing prefix matching.66% similarUnverifiedPrefix matching requires that only a contiguous sequence starting from the first token that is completely identical can hit the cache.65% similarUnverified支持反向引用的正则匹配问题是NP完全的63% similarUnverifiedWhen the data types on both sides of a WHERE condition or JOIN do not match, implicit type conversion occurs, causing index invalidation and full table scans, degrading query complexity from O(log n) to O(n).58% similarUnverifiedAdding ^ at the beginning of a pattern in re.search() is equivalent to prefix matching, while adding both ^ and $ at the beginning and end is equivalent to a full match.57% similar
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