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I'm trying to automagically remove all lines from a text file that contains a letter "T" that is not immediately followed by a "H". I've been using grep and sending the output to another file, but I can't come up with the magic regex that will help me do this.
I don't mind using awk, sed, or some other linux tool if grep isn't the right tool to be using.
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How to Exclude a Single Word with grep. The most simple way to exclude lines with a string or syntax match is by using grep and the -v flag. The output will be the example. txt text file but excluding any line that contains a string match with “ThisWord”.
To exclude particular words or lines, use the –invert-match option. Use grep -v as a shorter alternative. Exclude multiple words with grep by adding -E and use a pipe (|) to define the specific words.
To use negative matching in grep , you should execute the command with the -v or --invert-match flags. This will print only the lines that don't match the pattern given.
That should do it:
grep -v 'T[^H]' -v : print lines not matching
[^H]: matches any character but H
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