ned

TLDR

Recursively search starting in the current directory, ignoring case

$ ned --ignore-case --recursive '[^[dl]og]' [.]

Search always showing colored output

$ ned --colors '[^[dl]og]' [.]

Search never showing colored output

$ ned --colors=never '[^[dl]og]' [.]

Search ignoring certain files

$ ned --recursive --exclude '[*.htm]' '[^[dl]og]' [.]

Simple replace

$ ned '[dog]' --replace '[cat]' [.]

Replace using numbered group references

$ ned '[the ([a-z]+) dog and the ([a-z]+) dog]' --replace '[the $2 dog and the $1 dog]' [.]

Replace changing case

$ ned '[([a-z]+) dog]' --case-replacements --replace '[\U$1\E! dog]' --stdout [.]

Preview results of a find and replace without updating the target files

$ ned '[^[sb]ad]' --replace '[happy]' --stdout [.]