Why is the regex pattern '?!' not working with grep?
9141
Why does my regular expression work in X but not in Y?
132763
Why grep is returning non matching lines when I don't redirect stderr to stdout?
117475
How to grep for contents after pattern?
103189
What does the asterisk (*) do in grep -nri "searchString" *?
69214
How to use regex pattern in java?
427
Why does a RegExp with global flag give wrong results?
38429
How can I use inverse or negative wildcards when pattern matching in a unix/linux shell?
121382
Bash regular expression pattern matching spaces, within double brackets test, using "~=" operator
92530
Use of quotes in GNU grep regular expressions
15434
Regular expressions in a Bash case statement
84934
Why is the end-of-line $ anchor not working with the grep command, even though the front-of-line ^ anchor is?
111843
How do I grep for all non-ASCII characters?
73377
why is regex constructor not working?
141693
Why is this match pattern unreachable when using non-literal patterns?
115539
Using grep to search texts with single quote?
113601
What is the difference between .*? and .* regular expressions?
40539
How do I use regular expressions in bash scripts?