Use regular expressions to determine whether the content contains

[tiantian34]

I want to use if / else if / else regular expression to determine whether it contains content to add fields. I don't know how to write it. After testing, it can't be realized. Is there a code example? Thank you

old code
if [request_uri] =~ "png" {

}
How to write code with remap

[tobz]

@tiantian34 There are VRL functions for checking if a string matches a regular expression, but there's also a few other string-related functions for checking for if a string contains a substring, which may be beneficial to you given your example:

• contains will allow you to check to see if a substring is contained within a string
• starts_with/ends_with will let you check if a string starts with, or ends with, a specific substring
• match allows you to check if a string matches a regular expression (and match_any lets you check against multiple regular expressions at the same time)

You can see some examples of using the remap transform, including writing VRL, in the examples section here: https://vector.dev/docs/reference/configuration/transforms/remap/#examples.