Line Filter
Keep or exclude lines using literal, prefix, suffix, or regular-expression matching.
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How to use
Choose a rule and whether matching lines should be kept or excluded. Matching is case-insensitive by default; regular expressions use Unicode mode and are evaluated separately for each line.
Example
Input
INFO ready
ERROR failed
INFO done
Output
ERROR failed
Limitations
Regular expressions can be expensive, so execution belongs in the tool worker. This tool reports line matches, not multiline matches.
Frequently Asked Questions
Is a literal match an exact-line match?
No. Literal mode checks whether the text occurs anywhere; use Prefix or Suffix for edge matching.
Are regular expression flags supported?
Case sensitivity controls the i flag. Unicode mode is always enabled; global and multiline flags are unnecessary for per-line tests.