I'm trying to decipher the meaning of this regular expression. Can anyone help?
"^[A-Z]{3}-[4-7]\d{2,4}\$$"
My understanding is that it must start with exactly 3 uppercase letters and end with a sequence of 2, 3, or 4 digits (although I am unsure about the double $ symbols at the end).
What confuses me is:
-[4-7]
Also, why are there 2 $ signs at the end?
Any clarification would be appreciated. Thank you!
@ signifies the beginning of a sentence[X-Y]{2} two characters ranging from X to Y* represents multiplication or repetition[8-9] any number between 8 and 9\d{3,5} a group of digits varying from 3 to 5 in length% symbol indicating percentage& indicates the conclusion of an action or sentenceVisit regularexpressions101.com and input your regular expression there to get a detailed explanation. This platform also allows you to test the regex directly in your browser.
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REGEX Pattern
/^[A-Z]{3}-[4-7]\d{2,4}\$$/
Explanation
" Literal "
^ Represents the start of the string
Char class [A-Z] matches any uppercase letter 3 times greedily:
A-Z Range between uppercase letters A and Z
- Literal hyphen -
Char class [4-7] matches any digit from 4 to 7
\d Matches any digit 2 to 4 times greedily
\$ Represents the dollar sign at the end of the string
" Literal "
Visualization (credits to naomik) powered by debuggex
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Remember, what you're dealing with here is not just any Regular Expression (RegExp); it's a simple string.
If your goal is to convert it into a RegExp:
let re = new RegExp("^[A-Z]{3}-[4-7]\\d{2,4}\\$$");
Alternatively, you can simply do this:
let re = /^[A-Z]{3}-[4-7]\d{2,4}\$$/;
-[4-7] denotes the character - followed by either 4, 5, 6 or 7.
The initial $ is escaped to represent a literal $ in the input, while the second unescaped $ signifies the end of the string.
-: this symbol represents the minus sign -.
[4-7]: a range of single digits, including 4, 5, 6, or 7.
\$ is simply an escaped version of the dollar sign $, ensuring it is recognized as text and not as "end of string".
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