Published on

# Regex for percentage from 0 to 100

A percentage of numbers is a set of numbers that falls within a certain range or span. It represents the ratio. It is defined by the minimum and maximum values of the set. For example, the range of the numbers 0, 1, 2, 3, 4, ... 100 is 0 to 100. The minimum value in this range is 0, and the maximum value is 100. 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 percentage from 0 to 100

• Value should be a number
• Value should be in range from 0 to 100
• No special characters allowed
• No other characters allowed

# Regex for checking if value is in percentage from 0 to 100

Regular Expression for month name-

/^([0-9]|[1-9][0-9]|100)$/gm  Test string examples for the above regex- Input StringMatch Output 312does not match 0matches 44matches 73matches 100matches Here is a detailed explanation of the above regex- /^([0-9]|[1-9][0-9]|100)$/gm

1st Capturing Group ([0-9]|[1-9][0-9]|100)
1st Alternative [0-9]
Match a single character present in the list below [0-9]
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
2nd Alternative [1-9][0-9]
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)
Match a single character present in the list below [0-9]
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
3rd Alternative 100
100 matches the characters 100 literally (case sensitive)
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 100 using regex.