I need a regex for PORT input, it must allow only inputs like this:
gei_1/8 or xgei-0/7/0/5
-It must allow underscore and hyphen only at the start: gei_1 or xgei-0
-Then it must allow two digit numbers within a range of 0-48, separated by forward slash with no spaces between them. No more than three numbers: /7/0/48
-It cannot allow forward slash or anything at the end
Right now, I have the following Regex for the alphanumeric part: /^[A-Za-z][A-Za-z0-9]*(?:_[A-Za-z0-9]+)*$/
For the number part I have: ^(\d|1\d|2\d|3\d|4[0-8])\/(\d|1\d|2\d|3\d|4[0-8])\/(\d|1\d|2\d|3\d|4[0-8])$
Thanks for the help
To repeat the forward slash 1 - 3 times you could use a range to match 0-48 and repeat that 1-3 times using a quantifier {1,3}
(?:\/(?:[0-9]|[1-3][0-9]|4[0-8])){1,3}
The full pattern could look like
^[A-Za-z][A-Za-z0-9]*[_-][A-Za-z0-9]+(?:\/(?:[0-9]|[1-3][0-9]|4[0-8])){1,3}$
Regex demo
Related
I am trying to implement input number field which will not allow if number end with two 0's i.e. if I enter 23100 then it should not allow it.
I'm using the regex /^[0-9]*00$/ but it allowing 123100.
I have pasted my code
enter code here
You may use
/^(?!\d*00$)\d+$/
It will match
^ - start of string
(?!\d*00$) - a negative lookahead that makes sure no 0+ digits followed with 00 at the end are allowed
\d+ - one or more digits
$ - end of string
Updated now to now use look-behinds or look-aheads.
^\d*(?:\d?[1-9]|[1-9]\d)$
Demo
try this.
(^\d+[1-9]+0{0,1}$)
This will work for numbers like
12
123
12310
etc
any number with 2 or more 0's at the end doesn't match in this case
I need regular expression for validating a hashtag. Each hashtag should starts with hashtag("#").
Valid inputs:
1. #hashtag_abc
2. #simpleHashtag
3. #hashtag123
Invalid inputs:
1. #hashtag#
2. #hashtag#hashtag
I have been trying with this regex /#[a-zA-z0-9]/ but it is accepting invalid inputs also.
Any suggestions for how to do it?
The current accepted answer fails in a few places:
It accepts hashtags that have no letters in them (i.e. "#11111", "#___" both pass).
It will exclude hashtags that are separated by spaces ("hey there #friend" fails to match "#friend").
It doesn't allow you to place a min/max length on the hashtag.
It doesn't offer a lot of flexibility if you decide to add other symbols/characters to your valid input list.
Try the following regex:
/(^|\B)#(?![0-9_]+\b)([a-zA-Z0-9_]{1,30})(\b|\r)/g
It'll close up the above edge cases, and furthermore:
You can change {1,30} to your desired min/max
You can add other symbols to the [0-9_] and [a-zA-Z0-9_] blocks if you wish to later
Here's a link to the demo.
To answer the current question...
There are 2 issues:
[A-z] allows more than just letter chars ([, , ], ^, _, ` )
There is no quantifier after the character class and it only matches 1 char
Since you are validating the whole string, you also need anchors (^ and $)to ensure a full string match:
/^#\w+$/
See the regex demo.
If you want to extract specific valid hashtags from longer texts...
This is a bonus section as a lot of people seek to extract (not validate) hashtags, so here are a couple of solutions for you. Just mind that \w in JavaScript (and a lot of other regex libraries) equal to [a-zA-Z0-9_]:
#\w{1,30}\b - a # char followed with one to thirty word chars followed with a word boundary
\B#\w{1,30}\b - a # char that is either at the start of string or right after a non-word char, then one to thirty word (i.e. letter, digit, or underscore) chars followed with one to thirty word chars followed with a word boundary
\B#(?![\d_]+\b)(\w{1,30})\b - # that is either at the start of string or right after a non-word char, then one to thirty word (i.e. letter, digit, or underscore) chars (that cannot be just digits/underscores) followed with a word boundary
And last but not least, here is a Twitter hashtag regex from https://github.com/twitter/twitter-text/tree/master/js... Sorry, too long to paste in the SO post, here it is: https://gist.github.com/stribizhev/715ee1ee2dc1439ffd464d81d22f80d1.
You could try the this : /#[a-zA-Z0-9_]+/
This will only include letters, numbers & underscores.
A regex code that matches any hashtag.
In this approach any character is accepted in hashtags except main signs !##$%^&*()
(?<=(\s|^))#[^\s\!\#\#\$\%\^\&\*\(\)]+(?=(\s|$))
Usage Notes
Turn on "g" and "m" flags when using!
It is tested for Java and JavaScript languages via https://regex101.com and VSCode tools.
It is available on this repo.
Unicode general categories can help with that task:
/^#[\p{L}\p{Nd}_]+$/gu
I use \p{L} and \p{Nd} unicode categories to match any letter or decimal digit number. You can add any necessary category for your regex. The complete list of categories can be found here: https://unicode.org/reports/tr18/#General_Category_Property
Regex live demo:
https://regexr.com/5tvmo
useful and tested regex for detecting hashtags in the text
/(^|\s)(#[a-zA-Z\d_]+)/ig
examples of valid matching hashtag:
#abc
#ab_c
#ABC
#aBC
/\B(?:#|＃)((?![\p{N}_]+(?:$|\b|\s))(?:[\p{L}\p{M}\p{N}_]{1,60}))/ug
allow any language characters or characters with numbers or _.
numbers alone or numbers with _ are not allowed.
It's unicode regex, so if you are using Python, you may need to install regex.
to test it https://regex101.com/r/NLHUQh/1
I am trying to write business phone number regex in javascript, my requirements are:
It should contain only digits,dashes and whitespaces
It should not end with - but can end with whitespaces
There should be only 1 - between two groups
It should match numbers with and without - like 1, 123, 678-78
I have tried following regex but it fails for 123-- as it is invalid one anybody please suggest me something
/^([ ]*[0-9]+[-]?[0-9 ]*?([-])[ ]*[0-9]+[ ]*|[0-9 ]*[ ]*)+$/.test('123--2')
Try this
/^[0-9]+(-[0-9\s]+)*$/
I don't know if you still need an answer to this, but this works for your requirements:
/^(?!.+-\s*$)\s*((?:\d+\s*-?\s*)+)$/
Explanation:
^ start of string
(?!.+-\s*$) disallow - (or - followed by whitespace) at the end of the string
\s* optional leading spaces
( start capturing
(?:\d+\s*-?\s*)+ one or more groups of the following:
one or more digits,
possibly followed by whitespace,
possibly followed by a single hyphen,
possibly followed by more whitespace
) stop capturing
$ end of the string
Demo
I am not very experienced with regex and I need to validate phone numbers using javascript.
I have a textbox which need to be allowed to accept multiple phone numbers with a delimiter of ';' and the characters that can be allowed for the phone numbers are
Numbers
'+'
'-'
Could someone help me on how I can acheive this using javascript and regex/ regular expressions?
Example:
+91-9743574891;+1-570-456-2233;+66-12324576
I tried the following:
^[0-9-+;]+$
Am not sure if this is correct.
You have placed - in wrong place so, your regex is not working.
Try this(your RegEx, but slightly modified):
^[0-9+;-]+$
or
^[-0-9+;]+$
To include a hyphen within a character class then you must do one of the following:
escape the hyphen and use \-,
place hyphen either at the beginning or at the end of the character class.
As the hyphen is used for specifying a range of characters. So, regex engine understands [0-9-+;]+ match any of the characters between 0 to 9, 9 to +(all characters having decimal code-point 57[char 9] to 43[char +] and it fails) and ;.
To be a bit more restrictive, you could use the following regexp:
/^\+[0-9]+(-[0-9]+)+(;\+[0-9]+(-[0-9]+)+)*$/
What it will match:
+91-9743574891
+1-570-456-2233;+66-12324576
What it won't match:
91-9743574891
+15704562233
6612324576
How about this ^([0-9\-\+]{5,15};?)+$
Explanation:
^ #Match the start of the line
[0-9\-\+] #Allow any digit or a +/- (escaped)
{5,15} #Length restriction of between 5 and 15 (change as needed)
;? #An optional semicolon
+ #Pattern can be repeat once or more
$ #Until the end of the line
Only as restrictive as specified could be tighter, See it working here.
Your regex will match what you allow, but I would be a bit more restrictive:
^\+?[0-9-]+(?:;\+?[0-9-]+)*$
See it here on Regexr
That means match an optional "+" followed by a series of digits and dashes. Then there can be any amount of additional numbers starting with a semicolon, then the same pattern than for the first number.
I am building an application which should accept strings only with the following formats:
12345 (only a number)
12345;23456 (two or more numbers separated by ;)
12345-12367 (a range of numbers separated by a -)
The java script regex should allow only the above formats & shouldn't accept any other formats or symbols . Can anyone come up with a regex for this?
This is the RegExp that you need: /^\d+((;\d+)*|-\d+)?$/
(;\d+)* will check for multiple numbers separated by ";"
-\d+ will check for a range
Try
^[0-9]+([;-][0-9]+)?$
That should work
[0-9]+ matches 1 or more digits
[;-] matches a ; or a -
(...)? is an optional match
^ anchors the start and $ anchors the end of the string
^[0-9-;]{0,50}$
0-9 only accept numbers
-; allow only - and ;
{0,50} allow only 50 chars
Assuming that the number portions you are looking for are 5 digits each time, the following should match what you want.
[0-9]{5}((;|-)[0-9]{5}){0,1}
If you need different lengths, you can update the {5} with either another fixed length or a range such as {3,5} for a string of 3 to 5 digits. If you want to be able to capture more than two numbers with the speperators listed, you can use
[0-9]{5}((;|-)[0-9]{5})*