{"id":1016,"date":"2023-09-26T16:38:57","date_gmt":"2023-09-26T08:38:57","guid":{"rendered":"https:\/\/www.ruianding.com\/blog\/?p=1016"},"modified":"2023-11-07T10:38:27","modified_gmt":"2023-11-07T02:38:27","slug":"regex-cheatsheet","status":"publish","type":"post","link":"https:\/\/www.ruianding.com\/blog\/regex-cheatsheet\/","title":{"rendered":"RegEx Cheatsheet"},"content":{"rendered":"\n

Study Reference:<\/strong> learn-regex\/translations at master \u00b7 ziishaned\/learn-regex \u00b7 GitHub<\/a>
RegEx Online Test Tool:<\/strong> https:\/\/regex101.com\/<\/a><\/p>\n\n\n\n

What is RegEx?<\/h3>\n\n\n\n
\n

A regular expression is a group of characters or symbols which is used to find a specific pattern in a text.<\/p>\n<\/blockquote>\n\n\n\n

A regex is like a special pattern we look for in a bunch of letters. We use it to do things like changing words in a sentence, checking if a form is filled out correctly, or finding a part of a sentence that follows a certain pattern.<\/strong> Instead of saying “regular expression,” we often just say “regex” or “regexp” because it’s shorter.<\/p>\n\n\n\n

\n\n\n\n

1. Basic Matchers<\/h3>\n\n\n\n

A regular expression is just a pattern of characters that we use to perform a search in a text. For example, the regular expression cat<\/code> means: the letter c<\/code>, followed by the letter a<\/code>, followed by the letter t<\/code>.<\/p>\n\n\n\n

Regular expressions are normally case-sensitive<\/strong>, so the regular expression Cat<\/code> would not match the string cat<\/code>.<\/p>\n\n\n\n

\n\n\n\n

2. Meta Characters<\/h3>\n\n\n\n

Meta characters are like the ingredients we use to make regular expressions. They don’t represent themselves, but they have special meanings and are used in a unique way.<\/p>\n\n\n\n

2.1 Quantifiers<\/h4>\n\n\n\n
Meta Characters<\/strong><\/td>Descriptions<\/strong><\/td><\/tr>
? <\/td>Makes the preceding symbol optional.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

E.g.,<\/strong> The regular expression used?<\/code> is used to match strings that contain either use<\/code> or used<\/code>. The question mark ?<\/code> specifies that the preceding character or group (in this case, d<\/code>) is optional<\/strong>, meaning it can occur zero<\/strong> or one<\/strong> time.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n\n\n\n
Meta Characters<\/strong><\/td>Descriptions<\/strong><\/td><\/tr>
*<\/td>Matches 0 or more repetitions of the preceding symbol.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

E.g.,<\/strong> The regular expression ca*t<\/code> is used to match strings that start with c<\/code>, followed by zero<\/strong> or more occurrences<\/strong> of the character a<\/code>, and ending with the character t<\/code>. In this regular expression a<\/code> can be absent or repeated any number of times.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n\n\n\n
Meta Characters<\/strong><\/td>Descriptions<\/strong><\/td><\/tr>
+<\/td>Matches 1 or more repetitions of the preceding symbol.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

E.g.,<\/strong> The regular expression ca+t<\/code> is used to match strings that start with c<\/code>, followed by one<\/strong> or more occurrences<\/strong> of the character a<\/code>, and ending with the character t<\/code>. It will not match strings that have zero a<\/code> character between c<\/code> and t<\/code>.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n\n\n\n
Meta Characters<\/strong><\/td>Descriptions<\/strong><\/td><\/tr>
{n,m}<\/td>Braces. Matches at least “n” but not more than “m” repetitions of the preceding symbol.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

E.g., <\/strong>Regular expression ca{6,7}t<\/code> will match strings like caaaaaat<\/code> (6 a<\/code> characters) and caaaaaaat<\/code> (7 a<\/code> characters). It will not match strings with fewer than 6 or more than 7 a<\/code> characters between c<\/code> and t<\/code>.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

It can also be written as ca{n}t<\/code> with exact match “n” repetitions of the preceding symbol.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Further it can be implemented like ca{n,}t<\/code> with exact match “n” or more occurrences of the character greater than “n” repetitions of the preceding symbol.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n\n\n\n

2.2 Group<\/h4>\n\n\n\n
Meta Characters<\/strong><\/td>Descriptions<\/strong><\/td><\/tr>
(xyz)<\/td>Character group. Matches the characters xyz in that exact order.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

E.g., <\/strong>Regular expression (ca){2}t<\/code> is used to match strings that have the pattern ca<\/code> repeated exactly two times consecutively.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n\n\n\n

2.3 Alternation (OR Operator)<\/h4>\n\n\n\n
Meta Characters<\/strong><\/td>Descriptions<\/strong><\/td><\/tr>
|<\/td>Alternation. Matches either the characters before or the characters after the symbol.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

E.g., <\/strong>The regular expression a (cat|dog)<\/code> is used to match strings that contain the letter a<\/code> followed by a space and then either<\/strong> the word cat<\/code> or the word dog<\/code>.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n\n\n\n

2.4 Character Classes<\/h4>\n\n\n\n

Character classes are also called Character Sets. Square brackets []<\/code> are used to specify character sets. Use a hyphen inside a character set to specify the characters’ range. <\/strong><\/p>\n\n\n\n

The order of the character range inside the square brackets doesn’t matter.<\/p>\n\n\n\n

E.g.,<\/strong> [Tt]he<\/code> means: an uppercase T<\/code> or lowercase t<\/code>, followed by the letter h<\/code>, followed by the letter e<\/code>.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The following [a-z]<\/code> matches a single character in the range between a<\/strong> and z<\/strong> in lower case.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
2.4.1 Neglated Character Classes<\/strong><\/h5>\n\n\n\n

In general, the caret symbol ^<\/code> represents the start of the string, but when it is typed after the opening square bracket it negates the character class.<\/strong><\/p>\n\n\n\n

E.g.<\/strong>, the expression [^c]ar<\/code> means any character except c<\/code> followed by ar<\/code>.In other words, it matches any word that contains with ar<\/strong> but doesn’t start with the letter c<\/strong>.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n\n\n\n

3. Shorthand Character Sets<\/h3>\n\n\n\n
Shorthand<\/strong><\/td>Description<\/strong><\/td><\/tr>
.<\/td>Any character except new line<\/td><\/tr>
\\w<\/td>Matches alphanumeric characters: [a-zA-Z0-9_]<\/code><\/td><\/tr>
\\W<\/td>Matches non-alphanumeric characters: [^\\w]<\/code><\/td><\/tr>
\\d<\/td>Matches digits: [0-9]<\/code><\/td><\/tr>
\\D<\/td>Matches non-digits: [^\\d]<\/code><\/td><\/tr>
\\s<\/td>Matches whitespace characters: [\\t\\n\\f\\r\\p{Z}]<\/code><\/td><\/tr>
\\S<\/td>Matches non-whitespace characters: [^\\s]<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

Study Reference: learn-regex\/translations at master \u00b7 ziishaned\/learn-regex \u00b7 GitHubRegEx Online Test Tool: https:\/\/regex101.com\/ What is RegEx? A regular expression is a group of characters or symbols which is used to find a specific pattern in a text. A regex is like a special pattern we look for in a bunch of letters. We use it […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1016","post","type-post","status-publish","format-standard","hentry","category-miscellaneous"],"yoast_head":"\nRegEx Cheatsheet - \u6781\u7b80IT\uff5cSimpleIT<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ruianding.com\/blog\/regex-cheatsheet\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RegEx Cheatsheet - \u6781\u7b80IT\uff5cSimpleIT\" \/>\n<meta property=\"og:description\" content=\"Study Reference: learn-regex\/translations at master \u00b7 ziishaned\/learn-regex \u00b7 GitHubRegEx Online Test Tool: https:\/\/regex101.com\/ What is RegEx? 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