Programmer Humor

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The design is very human (piefedimages.s3.eu-central-003.backblazeb2.com)

submitted 5 months ago by RmDebArc_5@piefed.zip to c/programmer_humor@programming.dev

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[–] SatyrSack@lemmy.sdf.org 13 points 5 months ago (2 children)

How so? I have been getting much more comfortable with it lately, but I am curious what downsides there are

[–] Midnitte@beehaw.org 17 points 5 months ago (1 children)

The downsides are having to relearn it every time you need to understand it.

[–] goatbeard@beehaw.org 5 points 5 months ago

Just use something like https://regex101.com/

[–] cupcakezealot@piefed.blahaj.zone 11 points 5 months ago (1 children)

not really i just meant they suck to remember how to write without looking up :)

[–] SatyrSack@lemmy.sdf.org 23 points 5 months ago* (last edited 5 months ago)

Here is my cheatsheet that has been very helpful. Obviously, this will not teach you how RegEx works, but is a good quick reference when I forget the exact syntax for something.

RegExp

Character classes

Pattern	Description
`.`	Any character, except newline
`\w`	Word
`\d`	Digit
`\s`	Whitespace
`\W`	Not word
`\D`	Not digit
`\S`	Not whitespace
`[abc]`	Any of a, b, or c
`[a-e]`	Characters between `a` and `e`
`[1-9]`	Digit between `1` and `9`
`[[:print:]]`	Any printable character including spaces
`[^abc]`	Any character except `a`, `b` or `c`

Anchors

Pattern	Description
`\G`	Start of match
`^`	Start of string *
`$`	End of string *
`\A`	Start of string
`\Z`	End of string
`\z`	Absolute end of string
`\b`	A word boundary
`\B`	Non-word boundary
`^abc`	Start with `abc`
`abc$`	End with `abc`

For multiline patterns (m flag), ^ and $ will act as start and end of line.

Escaped characters

Pattern	Description
`\. \* \\`	Escape special character used by regex
`\t`	Tab
`\n`	Newline
`\r`	Carriage return

Groups

Pattern	Description
`(abc)`	Capture group
`(a\|b)`	Match `a` or `b`
`(?:abc)`	Match `abc`, but don't capture
`\1`	Substituted with text matched of the 1st capturing group

Quantifiers

Pattern	Description
`a*`	Match 0 or more
`a+`	Match 1 or more
`a?`	Match 0 or 1
`a{5}`	Match exactly 5
`a{,3}`	Match up to 3
`a{3,}`	Match 3 or more
`a{1,3}`	Match between 1 and 3

Lookahead & Lookbehind

| Pattern | Description | |

Raw Markdown

# RegExp

## Character classes

| Pattern       | Description                              |
| ------------- | ---------------------------------------- |
| `.`           | Any character, except newline            |
| `\w`          | Word                                     |
| `\d`          | Digit                                    |
| `\s`          | Whitespace                               |
| `\W`          | Not word                                 |
| `\D`          | Not digit                                |
| `\S`          | Not whitespace                           |
| `[abc]`       | Any of a, b, or c                        |
| `[a-e]`       | Characters between `a` and `e`           |
| `[1-9]`       | Digit between `1` and `9`                |
| `[[:print:]]` | Any printable character including spaces |
| `[^abc]`      | Any character except `a`, `b` or `c`     |

## Anchors

| Pattern | Description            |
| ------- | ---------------------- |
| `\G`    | Start of match         |
| `^`     | Start of string \*     |
| `$`     | End of string \*       |
| `\A`    | Start of string        |
| `\Z`    | End of string          |
| `\z`    | Absolute end of string |
| `\b`    | A word boundary        |
| `\B`    | Non-word boundary      |
| `^abc`  | Start with `abc`       |
| `abc$`  | End with `abc`         |

For multiline patterns (`m` flag), `^` and `$` will act as start and end of line.

## Escaped characters

| Pattern    | Description                            |
| ---------- | -------------------------------------- |
| `\. \* \\` | Escape special character used by regex |
| `\t`       | Tab                                    |
| `\n`       | Newline                                |
| `\r`       | Carriage return                        |

## Groups

| Pattern   | Description                                              |
| --------- | -------------------------------------------------------- |
| `(abc)`   | Capture group                                            |
| `(a\|b)`  | Match `a` or `b`                                         |
| `(?:abc)` | Match `abc`, but don't capture                           |
| `\1`      | Substituted with text matched of the 1st capturing group |


## Quantifiers

| Pattern  | Description           |
| -------- | --------------------- |
| `a*`     | Match 0 or more       |
| `a+`     | Match 1 or more       |
| `a?`     | Match 0 or 1          |
| `a{5}`   | Match exactly 5       |
| `a{,3}`  | Match up to 3         |
| `a{3,}`  | Match 3 or more       |
| `a{1,3}` | Match between 1 and 3 |

## Lookahead & Lookbehind

| Pattern                  | Description                                  |
|
***
                     |
***
                                         |
| `a(?=b)`                 | Match `a` in `baby` but not in `bay`         |
| `a(?!b)`                 | Match `a` in `Stan` but not in `Stab`        |
| `(?<=a)b`                | Match `b` in `crabs` but not in `cribs`      |
| `(?<!a)b`                | Match `b` in `fib` but not in `fab`          |
| `(?<![a-z])abc(?![a-z])` | Match `abc` without any letters before/after |