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10-regular-expressions-javascript/01-regexp-introduction/article.md
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Regular expressions is a powerful way of searching and replacing inside a string.
In Javascript regular expressions are implemented using objects of a built-in `RegExp` class and integrated with strings.
In JavaScript regular expressions are implemented using objects of a built-in `RegExp` class and integrated with strings.
Please note that regular expressions vary between programming languages. In this tutorial we concentrate on Javascript. Of course there's a lot in common, but they are a somewhat different in Perl, Ruby, PHP etc.
Please note that regular expressions vary between programming languages. In this tutorial we concentrate on JavaScript. Of course there's a lot in common, but they are a somewhat different in Perl, Ruby, PHP etc.
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@ -27,7 +27,7 @@ regexp = /pattern/; // no flags флагов
regexp = /pattern/gmi; // with flags g,m and i (to be covered soon)
```
Slashes `"/"` tell Javascript that we are creating a regular expression. They play the same role as quotes for strings.
Slashes `"/"` tell JavaScript that we are creating a regular expression. They play the same role as quotes for strings.
## Usage
@ -36,7 +36,7 @@ To search inside a string, we can use method [search](mdn:js/String/search).
Here's an example:
```js run
let str = "I love Javascript!"; // will search here
let str = "I love JavaScript!"; // will search here
let regexp = /love/;
alert( str.search(regexp) ); // 2
@ -47,7 +47,7 @@ The `str.search` method looks for the pattern `pattern:/love/` and returns the p
The code above is the same as:
```js run
let str = "I love Javascript!"; // will search here
let str = "I love JavaScript!"; // will search here
let substr = 'love';
alert( str.search(substr) ); // 2
@ -78,7 +78,7 @@ let search = prompt("What you want to search?", "love");
let regexp = new RegExp(search);
// find whatever the user wants
alert( "I love Javascript".search(regexp));
alert( "I love JavaScript".search(regexp));
```
````
@ -87,7 +87,7 @@ alert( "I love Javascript".search(regexp));
Regular expressions may have flags that affect the search.
There are only 5 of them in Javascript:
There are only 5 of them in JavaScript:
`i`
: With this flag the search is case-insensitive: no difference between `А` and `а` (see the example below).
@ -113,7 +113,7 @@ The simplest flag is `i`.
An example with it:
```js run
let str = "I love Javascript!";
let str = "I love JavaScript!";
alert( str.search(/LOVE/) ); // -1 (not found)
alert( str.search(/LOVE/i) ); // 2