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Update README.md

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Gregory 2018-12-23 23:01:20 -05:00 • committed by GitHub
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@ -34,7 +34,7 @@ Note: although `sed` has a nicer regex syntax with `-r`, it is not portable and
## Guide
1. By default, expressions are treated as literals.
1. **Literal mode**. By default, expressions are treated as literals.
```sh
> echo "lots((([]))) of special chars" | sd "((([])))" ""
@ -43,14 +43,14 @@ lots of special chars
Use `-r` or `--regex` to enable regex.
2. Basic regex use - let's trim some trailing whitespace
2. **Basic regex use** - let's trim some trailing whitespace
```sh
> echo "lorem ipsum 23 " | sd -r '\s+$' ''
lorem ipsum 23
```
3. Capturing useful information.
3. **Capture groups**
Indexed capture groups:
@ -66,7 +66,7 @@ Named capture groups:
123 dollars and 45 cents
```
If you stumble upon any ambiguities, just use `${1}` instead of `$1`:
If you stumble upon any ambiguities, just use `${var}` instead of `$var`:
```sh
> echo "123.45" | sd -r '(?P<dollars>\d+)\.(?P<cents>\d+)' '$dollars_dollars and $cents_cents'
@ -75,10 +75,7 @@ If you stumble upon any ambiguities, just use `${1}` instead of `$1`:
123_dollars and 45_cents
```
You may choose to always use `${1}` or only add as necessary.
4. Find & replace in files
4. **Find & replace in files**
```sh
> sd "window.fetch" "fetch" -i http.js
@ -89,10 +86,10 @@ That's it.
Do a dry run:
```sh
> sd "window.fetch" "fetch" < http.js | less
> sd "window.fetch" "fetch" < http.js
```
5. Find & replace across your project
5. **Find & replace across project**
Good ol' unix philosophy to the rescue.