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Usernames Yes/No
“6789” Yes
“33333333_TL” No
“34567890-Shhh” No
“123456-Hero” Yes
“1234567” Yes
“New12345678” No
“87456773kk” No
“1234567890” No
See Regex to check for 4 consecutive numbers.
First check if your string's length >= 8 and then use a regex to look for N consecutive digits and if it finds a fit - your validation fails. Something like - /[^\d]\d{8}[^\d]/
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I am trying to create a validation expression for a table name in the format of:
Name_TableName_YYYYMMDD
right now I have something like this:
^[a-zA-Z0-9][^_]+[a-zA-Z0-9][^_]+\d{8}
Number at the end can read 8 digits.
You could try this (very basic) expression
[a-zA-Z]+_[a-zA-Z]+_[0-9]{4}(0[1-9]|1[0-2])(0[1-9]|[1-2][0-9]|3[0-1])
Link to a test
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We have for egz. 4.7(8+3) how add multiple character between digit and bracket4.7*(8+3)
Capture digit followed by bracket into two groups, then replace matched value with group values and multiple character between them:
Regex.Replace(input, #"(\d)(\()", "$1*$2")
For input "4.7(5+(8+3)/1(1-2))" result will be "4.7*(5+(8+3)/1*(1-2))"
Keep it simple: REplace ( by *(
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I saw this post in internet about the restrictions on Skype name
A Skype username cannot be shorter than six characters or longer than
32. It can contain both letters and numbers, but must start with a letter; accented characters are not allowed. The only punctuation
marks you can use are commas, dashes, periods and underscores.
What is the regular expression that restrict these rules in C#?
Regards
maybe you can try this:
/^[A-Za-z\d\,\-\.\_]{6,32}$/
EDIT: make alphabets case-insensetive
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I am trying to write a regex template that matches all the strings that doesn't contain a certain template.
E.g.:
Matches:
This is my friend. He is very nice.
in
This is my friend. He is very nice.
but doesn't match anything in :
This is my friend John Michaels Fredrickson. He is very nice.
Because it contains something like this: ([A-Z][a-z]+\s?){3}
You can use negative lookahead:
^(?!.*?([A-Z][a-z]+\W){3}).*$
RegEx Demo
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I need a hand creating a regular expression for .net that matches a comma separated list of years
Examples:
1990
1985,1990,2004
Year range between 1900 and 2100
Year range between 1900 and 2100
^(?:19\d\d|2(?:100|0\d\d))(?:,(?:19\d\d|2(?:100|0\d\d)))*$
DEMO