code4mk/lets-regex

Lets learn RegEx ( Regular Expression) with fun . 💗 code4mk

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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

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