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5-regular-expressions/01-regexp-introduction/article.md

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 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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 ## Regular expressions
 
 A regular expression (also "regexp", or just "reg") consists of a *pattern* and optional *flags*.

5-regular-expressions/02-regexp-methods/article.md

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 The structure is a bit messed up, so we'll first consider methods separately, and then -- practical recipes for common tasks.
 
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 ## str.search(reg)
 
 We've seen this method already. It returns the position of the first match or `-1` if none found:

5-regular-expressions/03-regexp-character-classes/article.md

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 A character class is a special notation that matches any symbol from the set.
 
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 For instance, there's a "digit" class. It's written as `\d`. We put it in the pattern, and during the search any digit matches it.
 
 For instance, the regexp `pattern:/\d/` looks for a single digit:

5-regular-expressions/05-regexp-character-sets-and-ranges/article.md

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 Several characters or character classes inside square brackets `[…]` mean to "search for any character among given".
 
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 ## Sets
 
 For instance, `pattern:[eao]` means any of the 3 characters: `'a'`, `'e'`, or `'o'`.

5-regular-expressions/08-regexp-greedy-and-lazy/article.md

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 We should understand how the search works very well if we plan to look for something more complex than `pattern:/\d+/`.
 
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 Let's take the following task as an example.
 
 We have a text and need to replace all quotes `"..."` with guillemet marks: `«...»`. They are preferred for typography in many countries.

5-regular-expressions/09-regexp-groups/article.md

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 1. It allows to place a part of the match into a separate array item when using  [String#match](mdn:js/String/match) or [RegExp#exec](mdn:/RegExp/exec) methods.
 2. If we put a quantifier after the parentheses, it applies to the parentheses as a whole, not the last character.
 
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 ## Example
 
 In the example below the pattern `pattern:(go)+` finds one or more `match:'go'`:

5-regular-expressions/10-regexp-backreferences/article.md

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 Capturing groups may be accessed not only in the result, but in the replacement string, and in the pattern too.
 
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 ## Group in replacement: $n
 
 When we are using `replace` method, we can access n-th group in the replacement string using `$n`.

5-regular-expressions/11-regexp-alternation/article.md

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 In a regular expression it is denoted with a vertical line character `pattern:|`.
 
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 For instance, we need to find programming languages: HTML, PHP, Java or JavaScript.
 
 The corresponding regexp: `pattern:html|php|java(script)?`.

5-regular-expressions/12-regexp-anchors/article.md

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 The caret `pattern:'^'` and dollar `pattern:'$'` characters have special meaning in a regexp. They are called "anchors".
 
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 The caret `pattern:^` matches at the beginning of the text, and the dollar `pattern:$` -- in the end.
 
 For instance, let's test if the text starts with `Mary`:

5-regular-expressions/13-regexp-multiline-mode/article.md

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 The multiline mode is enabled by the flag `pattern:/.../m`.
 
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 It only affects the behavior of `pattern:^` and `pattern:$`.
 
 In the multiline mode they match not only at the beginning and end of the string, but also at start/end of line.

5-regular-expressions/15-regexp-infinite-backtracking-problem/article.md

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 So the problem is definitely worth to deal with.
 
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 ## Example
 
 The plan will be like this: