A range of numbers is a set of numbers that falls within a certain range or span. It is defined by the minimum and maximum values of the set. For example, the range of the numbers 1, 2, 3, 4, … 10 is 1 to 10. The minimum value in this range is 1, and the maximum value is 10. In this article let’s understand how we can create a regex for month and how regex can be matched for a given month name.
Regex (short for regular expression) is a powerful tool used for searching and manipulating text. It is composed of a sequence of characters that define a search pattern. Regex can be used to find patterns in large amounts of text, validate user input, and manipulate strings. It is widely used in programming languages, text editors, and command line tools.
Structure of a range from 1 to 10
- Value should be a number
- Value should be in range from 1 to 10
- No special characters allowed
- No other characters allowed
Regex for checking if value is in range from 1 to 10
Regular Expression for month name-
/^([1-9]|10)$/gmTest string examples for the above regex-
| Input String | Match Output |
|---|---|
| 12 | does not match |
| 0 | does not match |
| 4 | matches |
| 7 | matches |
| 10 | matches |
Here is a detailed explanation of the above regex-
/^([1-9]|10)$/gm
^ asserts position at start of a line
1st Capturing Group ([1-9]|10)
1st Alternative [1-9]
Match a single character present in the list below [1-9]
1-9 matches a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)
2nd Alternative 10
10 matches the characters 10 literally (case sensitive)
$ asserts position at the end of a line
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Hope this article was useful to check if the value is in range from 1 to 10 using regex. In summary, understanding ranges of numbers and using regular expressions (regex) to validate and manipulate text are essential skills in programming and data manipulation. This article explained the concept of ranges, demonstrated regex usage for month names, and provided insights into crafting effective regex patterns. By mastering these techniques, developers can efficiently handle text-based tasks and enhance their programming capabilities.
