mongodb wildcard query from grails/groovy - mongodb

Question

I’m having some problems with issuing a wildcard query in MongoDB from my Grails application.
Basically the way I am doing it now is by issuing a find query with an array of query parameters:
db.log.find(criteria) -> where criteria is an array [testId:"test"]
This works fine as long as I’m strictly querying on actual values. However, for fun, I tried it with a wildcard search instead:
db.log.find(criteria) -> this time critera = [testId:/.*te.*/]
This however will after looking at the Mongo query log as:
query: { query: { testId: "/.*te.*/" }
hence making the query not a wildcard search, but a query for this as a string, instead.
Is there a way to work around this in some sense still using this concept of querying?
Thanks in advance!

Answer 1

Use the Groovy Pattern shortcut ~ to specify that your query is a regular expression.
db.log.find(['testId': ~/.*te.*/])
See this blog post for more info

Answer 2

To use regex query, define query condition with $regex operator
def regexCondition = ['$regex': '/.*te.*/']
def criteria = ['testId': regexCondition]
db.log.find(criteria)

Answer 3

This worked for me:
In your groovy file:
db.collectionName.find([fieldName:[$regex:'pattern']])
More or less, use a regular mongodb query, but replace the {} with [].