mongodb regex search code example

Example 1: pymongo regex search

# use $regex to find docs that start with case-sensitive letter "obje"
query = { "field": { "$regex": 'obje.*' } }
docs = col.count_documents( query )
print ("query:", query)
print ("$regex using '.___*' -- total:", docs, "\n")

# the query between the ^ and $ char are for finding exact matches
query = { "field": { "$regex": '^ObjectRocket 2$' } }
docs = col.count_documents( query )
print ("query:", query)
print ("$regex using '^___$' -- total:", docs, "\n")

# use $options:'i' to make the query case-insensitive
query = { "field": { "$regex": 'oBjEcT', "$options" :'i' } }
docs = col.count_documents( query )
print ("query:", query)
print ("$regex using $options 'i' -- total:", docs, "\n")

# making Regex query without the '$regex' operator
query = { "field": 'Object Rocket 222' }
docs = col.count_documents( query )
print ("query:", query)
print ("exact match without '$regex' -- total:", docs, "\n")

Example 2: mongodb regex case insensitive

db.collection.find({name:{'$regex' : '^((?!string).)*$', '$options' : 'i'}})

Example 3: mongodb regex

{ <field>: { $regex: /pattern/, $options: '<options>' } }
{ <field>: { $regex: 'pattern', $options: '<options>' } }
{ <field>: { $regex: /pattern/<options> } }

Example 4: "compass" mongodb filter or search regex

{
  email: RegExp('@gmail.com$', 'i')
}