| # | Title | regex | Description/notes |
|---|---|---|---|
| 1 | Regex to allow alphanumeric, spaces, some special characters | ^(?!\d+$)(?:[a-zA-Z0-9][a-zA-Z0-9 @&$]*)?$ |
not allowing only number |
^(?!$)(?:[A-Za-z0-9][A-Za-z0-9 @&$,.?_-]*)?$ |
getting invalid character class due to - | ||
^.*(?<!^\s)$ |
old used | ||
^(?! )[\-a-zA-Z0-9 @&$,.?_]+(?! )$ |
working till now no space start end and special character | ||
| 2 | No space/null only alphabet and number with - only and no space between | ^(?!\s)[a-zA-Z0-9-]*$ |
|
| 3 | No space, no special char, no number for lang/city/etc | ^(?:[a-zA-Z][a-zA-Z]*)?$ |
|
| 4 | valid url | /[(http(s)?):\/\/(www\.)?a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&\/\/=]*)/ |
|
| 5 | Search vs code | op=.*aws | op= with aws in same line |
| 6 | Put cursor to end of each line vs code | cmd+shft+L/ctr+alt+i |
|
| 7 | AppSec validation | /<(script |
html |
| Rule | Description |
|---|---|
^The |
matches any string that starts with The |
end$ |
matches a string that ends with end |
^The end$ |
exact string match (starts and ends with The end) |
roar |
matches any string that has the text roar in it |
| - | - |
abc* |
matches a string that has ab followed by zero or more c |
abc+ |
matches a string that has ab followed by one or more c |
abc? |
matches a string that has ab followed by zero or one |
abc{2} |
matches a string that has ab followed by 2 |
abc{2,} |
matches a string that has ab followed by 2 more c |
abc{2,5} |
matches a string that has ab followed by 2 up to 5 |
a(bc)* |
matches a string that has a followed by zero or more copies of the sequence bc |
a(bc){2,5} |
match a string that has a followed by 2 up to 5 copies of the sequence bc |
$^\*.[() |
All these symb has special meaning need to escape by \ if comes after some symb |
. |
One character |
a+ |
One or more occurrences of a |
a* |
Zero or more occurrences of a |
a? |
Zero or one repetition of a |
| Expression | Description | Example |
|---|---|---|
foo.bar |
represents single character | fooabar,fooxbar |
foo.*bar |
zero or more ocuurance | foobar,fooabar,fooxxbar,fooabcbar |
foo\s*bar |
\s represent single space |
foo bar,foo bar,foo bar |
[fcl]oo |
Character class restricted to fcl | foo,coo,loo |
[^fcl]oo |
Any character except fcl | moo,zoo,koo |
[j-m]oo |
Character range from j to m | moo,joo,koo |
[j-mz]oo |
Character range from j to m and z | moo,joo,koo,loo,zoo |
[j-mJ-Mz]oo |
Character range from j to m and z | Moo,joo,koo,Loo,zoo |
x*[.#&]y* |
No need to escape period in square bracket..escape added for md file for or symbol | x.y,xx#yyy,x&y |
^foo.* |
start with foo after that any thing | foo bar,fooadfvfv,foo bar baz |
.*bar$ |
End with bar before that any thing | foo baz bar,baz foo bar |
x*[\^\-]y* |
^ and - has special meaning so need to escape in bracket | |
x*[\\]y* |
\ need to be escaped anywhere present | |
^[0-9]{3}$ |
a{m}Ex.^[0-9][0-9][0-9]$This number signifies the number of repetitions.So a followed by the number 'm' in curly braces means exactly 'm' repetitions of the letter 'a'. |
321,345,999 |
^[a-z]{4,6}$ |
So m and n denote the range of repetitions So if we say a, it represents at least 'm' repetitions of the letter 'a' and at most 'n' repetitions of the letter 'a'. | lion,tiger,cuckoo |
(ha){4,} |
Parantheses are used to treat a group of characters as a single entity. We will enclose the 'h' and 'a' together in parantheses. So when the regex engine sees the curly brace repeater, it will take whatever is inside the parantheses and apply the repetition to it.So this means at least 4 repetitions of 'ha' should be present.The maximum repetitions coulde be anything. | hahahaha, hahahahaha, hahahahaha |
fooa+bar |
One or more occurrences of a | fooabar,fooaabar |
http?s://website |
Zero or one repetition of s | http://website,https://website |
(log|ply)wood |
log or ply | logwood, plywood |
- Caret is used as a negation symbol,but ONLY if it is within square brackets or within a character class.
- $ is a placeholder that signifies the end of a line.
Working regex for url
let regexUrlWorking = /^((ftp|http|https):\/\/)?(www.)?(?!.*(ftp|http|https|www.))[a-zA-Z0-9_-]+(\.[a-zA-Z]+)+((\/)[-a-zA-Z0-9\@\:\%\_\+\*\.\~\#\?\&\/\/\=]+)?\/?$/
let finalRegexWorking = /^((ftp|http|https):\/\/)?(www.)?(?!.*(www.))[a-zA-Z0-9_-]+(\.[a-zA-Z]{2,})+((\/)[-a-zA-Z0-9\@\:\%\_\+\*\.\~\#\!\?\&\/\/\=]+)?\/?$/Numeric range
^$|^([0-9]|[1-9][0-9]|[1-9][0-9][0-9]|[1-9][0-9][0-9][0-9]|1[0-4][0-9][0-9][0-9]|15000)$ //=>0-15000
^$|^([1-9][5-9]|[2-9][0-9]|[1-3][0-9][0-9]|[4][0-7][0-9]|480)$ //=>15-480
^$|^([5-9]|[0-9][0-9]|[1-6][0-9][0-9]|[7][0-1][0-9]|720)$ //=>5-720Note
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