CODEWITHSUNDEEP
google-cloud-firestorefirebase-security
Behzad Hosseini
Behzad Hosseini

Reputation: 21

Where to put the "i" flag in Firestore Security Rules str.matches(regex)?

I'm writing Security Rules for my Firebase Firestore project, but I can't seem to find a reference that exemplifies the correct syntax for using matches() method with a regular expression as the parameter. Here's what I use now:

request.resource.data.str.matches("^[a-z0-9]+$");

My question is now, where to put the case-insensitive flag "i" in the expression? I tried some different combinations but didn't work.

Thanks.

Upvotes: 2

Views: 747

Answers (1)

Frank van Puffelen
Frank van Puffelen

Reputation: 600006

Firestore security rules follow the Google RE2 format for regular expressions.

This means you can define a non-capturing group for your match, and flag that group to use case-insensitive matching with:

allow write: if request.resource.data.str.matches("(?i:^[a-z0-9]+)$");

Of course you can also simply expand the character group to include both uppercase and lowercase ASCII characters:

allow write: if request.resource.data.str.matches("^[a-zA-Z0-9]+$");

Upvotes: 3

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