Regex from Bash, VIM & Regex from Frontend Masters

regex.sh

# regular expressions

# system tools with regex: grep, sed, perl, vim, less

``` js 
'1 two three \n'.replace(/1/, 'one')
```

similar to:
``` sh
echo '1 two three' | sed 's/1/one/'
```
# s/ means substitution
# sed -r and grep -E to not have to escape certain metacharacters
echo 'the the whatever dogs dogs etc' | sed 's/(\w+) \1/\1/g'
# prints the whatever dogs etc

# modify word in file
sed 's/cool/k001/g' -i file.txt

# perldoc perlreref docs for regex