--- metadata: - name: generator content: Diplodoc Platform v5.54.2 alternate: - https://yandex.com/support/webmaster/en/service/regexp.md - https://yandex.com/support/webmaster/tr/service/regexp.md - href: en/service/regexp.md type: text/markdown title: Markdown version - href: ../llms.txt type: text/markdown title: llms.txt --- > **Documentation Index:** Fetch the complete configuration index at https://yandex.com/support/webmaster/en/llms.txt # Regular expressions [Regular expressions](http://en.wikipedia.org/wiki/Regexp) can be used to filter the URL data in Yandex Webmaster: - [Pages included in the search](https://yandex.com/support/webmaster/en/service/searchable.md). - [Crawl stats for the site pages](https://yandex.com/support/webmaster/en/service/site-indexing.md). - [External links](https://yandex.com/support/webmaster/en/site-indexing/external-links.md); - [Query monitoring](https://yandex.com/support/webmaster/en/service/popular-queries.md). Expressions are parsed according to the [RE2](https://github.com/google/re2/blob/master/doc/syntax.txt) syntax and the following rules: - The regular expression is applied to the entire URL of the page including the protocol and domain. For example, you can use the following regular expression: `^http://`. - A regular expression is applied twice: to the original URL and the URL with the `www` prefix and without it. The presence of the `www` prefix in the domain doesn't affect the result of expression validation. - The regular expression is applied to the decoded URL where the URL codes (% sequences) are replaced with decoded characters. Exception: the codes for the `/`, `&`, `=`, `?`, and `#` characters aren't replaced. For example, `%2F` isn't replaced with `/`. Note that the `+` character is replaced with a space. For example, the regular expression `text=elephant` will be processed, but `text=%D1%81%D0%BB%D0%BE%D0%BD` and `text=%\w\w` won't. - Cyrillic URL doesn't use punycode. For example, the regular expression `^http://ввв\.сайт\.рф/` will be processed, but `^http://xn--b1aaa\.xn--80aswg\.xn--p1ai/` won't. - Some characters are excluded from the URL ending before the regular expressions check: `?`, `#`, `&`, as well as period (`.`). For example, the URLs `http://example.com/?`, `http://example.com/#`, `http://example.com/?var=1&` are compared with `http://example.com/`, `http://example.com/`, `http://example.com/?var=1` respectively. If the user enters the URL `http://example.com./`, the regular expression `\./$` isn't processed. - In the checked regular expressions, quantifiers match as many characters as possible. - The URL characters are case-sensitive. ## Regular expressions memo In the table below, `a`, `b`, `c`, `d`, `e` are any characters, `n`, `m` are positive numbers. #| || **Possible options** | > || || abc\|de | Matches one of the options: `abc` or `de`. || || **Classes of characters** | > || || [abc] or [a-c] | Matches any (one) character of the list (or from the range). || || [^abc] or [^a-c] | Matches any (one) character except those listed (or those from the range). || || \d | Matches a digit character. Equivalent to `[0-9]`. || || \D | Matches a non-digit character. Equivalent to `[^0-9]`. || || \s | Matches a space character. Equivalent to `[\t\n\f\r]`. || || \S | Matches a non-white-space character. Equivalent to `[^\t\n\f\r ]`. || || \pL | Matches any [Unicode](https://en.wikipedia.org/wiki/Unicode) character. || || \w | Matches any **Latin letter** of any case, digit or the underscore character. When working with the Unicode characters, use the `\pL` class instead of \w. || || \W | Matches any character **other than a Latin letter** of any case, a digit or an underscore. When working with the Unicode characters, use the `\pL` class instead of \w. || || **Number of occurrences (quantifiers)** | > || || a* | Matches the `a` character repeated 0 or more times (the longest possible sequence). || || a+ | Matches the `a` character repeated 1 or more times (the longest possible sequence). || || a? | Matches the `a` character repeated 0 or 1 time (the presence of the character is a priority). || || a\{n,m\} | Matches the `a` character repeated at least `n` times and not more than `m` times (the longest possible sequence). || || a\{n,\} | Matches the `a` character repeated at least `n` times (the longest possible sequence). || || a\{n\} | Matches the `a` character repeated `n` times. || || a*? | Matches the `a` character repeated 0 or more times (the shortest possible sequence). || || a+? | Matches the `a` character repeated 1 or more times (the shortest possible sequence). || || a?? | Matches the _a_ character repeated 0 or 1 time (the presence of the character is a priority). || || a\{n,m\}? | Matches the `a` character repeated at least `n` times and not more than `m` times (the longest possible sequence). || || a\{n,\}? | Matches the `a` character repeated at least `n` times (the shortest possible sequence). || || **Position in the line:** | > || || \^ | Matches the beginning of a string. || || \$ | Matches the end of a string. || || \b | Matches the word boundary — the position between the alphanumeric character (`\w`) and non-alphanumeric (`\W`) character. || || \B | Matches a non-word boundary. Defined through the `\w` and `\W` classes. || || **Escaping** || || \ | A backslash before a ##[ ] \ ^ $ . \| ? * + ( ) { }## special character means that this character is not special and should be interpreted literally. Example: `\$` corresponds to the dollar sign. || || \Q...\E | All special characters between `\Q`and`\E` are interpreted as common characters. || |# [Contact support](https://yandex.com/support/webmaster/en/troubleshooting.md){.button}



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