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Regex for Underscore

Regex for Underscore

Underscore is represented by _ and can be keyed in using the keyboard using the SHIFT + _ in most computers. In this article let's understand how we can create a regex for underscore and how regex can be matched for underscore values.

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.

Conditions to match a Underscore value

The value _ should be present in the string.

Regex for checking if its a valid Underscore value

Regular Expression-

/[_]/gm

Test string examples for the above regex-

Input StringMatch Output
zerodoes not match
-_-matches
1does not match
int_variablematches
1_0matches

Here is a detailed explanation of the above regex-

/[_]/gm

Match a single character present in the list below [_]
_ matches the character _ with index 9510 (5F16 or 1378) 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 the validity of a underscore value using regex.