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Can regular expressions be used to match nested patterns?
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extract lines that match a list of words in another file
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How do I compare two strings in Perl?
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Find multiple patterns with a single preg_match_all in PHP
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printing a block of text that matches a pattern
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Validating that a hash is over a specific value for two hashes with additional (known but different) input
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Pattern matching multiple symbols names and powers
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How do I match any character across multiple lines in a regular expression?
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Search for multiple patterns from a file using find command