https://github.com/code4mk/lets-regex

Lets learn RegEx ( Regular Expression) with fun . 💗 code4mk
https://github.com/code4mk/lets-regex

regex regular-expression

Last synced: 22 days ago
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Lets learn RegEx ( Regular Expression) with fun . 💗 code4mk

• Host: GitHub
• URL: https://github.com/code4mk/lets-regex
• Owner: code4mk
• Created: 2018-04-14T05:48:36.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2021-04-22T03:59:47.000Z (almost 4 years ago)
• Last Synced: 2024-11-13T10:52:38.762Z (3 months ago)
• Topics: regex, regular-expression
• Homepage: https://code4mk.org/javascript-developer/js/regex
• Size: 4.88 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        

[go to code4mk for better view](https://code4mk.org/javascript-developer/js/regex)

## regex tips

|short    | description     |

| :------------- | :------------- |

|`^`|start|

|`$`|end|

|`pipe`|or / alternate|

|`*`|0 or more|

|`+`|1 or more|

|`\`|escape specialess|

|`?`|0 or one|

|`{3}`|exact 3|

|`{3,}`|3 or more|

|`{3,5}`|3,4 or 5|

|`()`|group|

|`[]`|set|

|`[^abc]`|not abc|

|`[abc]`|a.b or c|

|`[A-Z]`| uppercase A to Z|

|`[a-z]`| lowercase a to z|

|`[a-zA-Z]`| lowercase and uppercase a to z|

|`[0-9]`|0 to 9|

* NB:  `pipe` = `|`

## basic 2 regex

|short    | description     |

| :------------- | :------------- |

|`\n`|newline|

|`\t`|tab|

|`\r`|Carriage return|

|`\f`|Form feed|

## character set table

| short  | description     |

| :------------- | :------------- |

| `\w `    | alphanumeric `[a-zA-Z0-9_]` |

|`\W`| non alphanumeric `[a-zA-Z0-9_]` . [\W] = `[^\w]`|

|`\d`|digit [0-9]|

|`\D`|non digit [0-9]|

|`\s`|whitespace `[\t\n\f\r\p{Z}]`|

|`\S`|non whitespace|

## flag

| short  | description     |

| :------------- | :------------- |

| g    | global |

|m| multi-line|

|i|case i­nse­nsitive|

* [Next](https://github.com/code4mk/lets-regex/blob/master/basic.md)