How to Perform Case-Insensitive Regular Expressions in Go?

Performing Case-Insensitive Regular Expressions in Go

When constructing regular expressions dynamically from user input, making them case-insensitive is a common requirement. The need arises when the input string may contain both uppercase and lowercase characters, but the match should consider them equivalent.

A simple approach is to manually handle both cases in the regular expression, as seen in this example:

reg, err := regexp.Compile(`[a-zA-Z]`)

However, if the regular expression is constructed from a string, a more elegant solution is available.

To create a case-insensitive regular expression, add (?i) to the beginning of the expression:

reg, err := regexp.Compile("(?i)" + strings.Replace(s.Name, " ", "[ \._-]", -1))

This flag causes the regular expression engine to ignore case distinctions, making the match case-insensitive.

For more information on regular expression flags, refer to the regexp/syntax package documentation under the "flags" term.

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