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Update regexps.qmd (#1065)

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Fixed a few errors. Could you also explain why there are two dots in "..\\1" rather than three dots or some other numbers of dots?
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Y. Yu
2022-08-16 12:39:20 -04:00
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commit 1380affcd2
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regexps.qmd
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@@ -456,7 +456,7 @@ All of these are these described below.
### Matching a repeated pattern ### Matching a repeated pattern
You can refer back to previously matched text inside parentheses by using **back reference**. You can refer back to previously matched text inside parentheses by using **back reference**.
Back references are usually numbered: `\1` refers to the match contained in the first parentheses, `\2` in the the second parentheses, and so on. Back references are usually numbered: `\1` refers to the match contained in the first parenthesis, `\2` in the second parenthesis, and so on.
For example, the following pattern finds all fruits that have a repeated pair of letters: For example, the following pattern finds all fruits that have a repeated pair of letters:
```{r} ```{r}