query: Grep regex not working
positive_passages.docid: 9141
positive_passages.text: Why does my regular expression work in X but not in Y?
negative_passages.docid: 133306
negative_passages.text: Grepping through .gz log files
negative_passages.docid: 150775
negative_passages.text: Grep for literal strings
negative_passages.docid: 111843
negative_passages.text: How do I grep for all non-ASCII characters?
negative_passages.docid: 56129
negative_passages.text: Match with grep when pattern contains hyphen "-"
negative_passages.docid: 63928
negative_passages.text: regex error - nothing to repeat
negative_passages.docid: 107175
negative_passages.text: How to print matched regex pattern using awk?
negative_passages.docid: 92530
negative_passages.text: Use of quotes in GNU grep regular expressions
negative_passages.docid: 132763
negative_passages.text: Why grep is returning non matching lines when I don't redirect stderr to stdout?
negative_passages.docid: 131236
negative_passages.text: what's wrong with my grep command?
negative_passages.docid: 4697
negative_passages.text: bash regex with quotes?
negative_passages.docid: 53523
negative_passages.text: How to use regex in string in java?
negative_passages.docid: 14398
negative_passages.text: How to grep-inverse-match and exclude "before" and "after" lines
negative_passages.docid: 52920
negative_passages.text: Can grep return true/false or are there alternative methods
negative_passages.docid: 32137
negative_passages.text: Regex doesn't work in String.matches()
negative_passages.docid: 137248
negative_passages.text: regular expressions / pattern matching on ubuntu command line
negative_passages.docid: 136596
negative_passages.text: grep lines starting with "1" in Ubuntu