Regular expression grep examples11/20/2023 That egrep command searches for those three strings (regular expressions, really) in all files in the current directory. -F, -fixed-strings list of fixed strings -G, -basic-regexp basic regular expression (default) Output. An easier egrep commandīefore I go away, here's an easier egrep command to look at: While my original locate -i calendar command shows nearly 3,000 files, the locate command combined with grep and egrep in this manner shows only 15 files. I used the -v argument to perform the "opposite" meaning of a normal egrep command, so strings with these patterns were not shown and also used the -i argument to perform a case insensitive egrep search here. Used the egrep command with multiple regex patterns to reduce the output much more.Used the grep command so the output would only display files and directories with the string "Users" in them.Used to locate command with the case-insensitive option to find all files with the string "calendar" in them.no-index Search files in the current directory that is not managed by Git. The above command will print lines matching all the patterns at once. Locate -i calendar | grep Users | egrep -vi 'twiki|gif|shtml|drupal-7|java|PNG'Īs you can see from that command, I did this: Here is the syntax using git grep combining multiple patterns using Boolean expressions: git grep -no-index -e pattern1 -and -e pattern2 -and -e pattern3. Summary: How to use the Linux egrep command with multiple regular expressions (regex patterns).Īs a quick note here today, I just used the Linux egrep command to perform a case-insensitive search on multiple regular expressions (regex patterns). Really, what I did was a little more complicated:
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