# QueryModifier **`class QueryModifier(config)`** Bases: [`BatchedStep`](../technical/libnlp/steps/standard.md#squirro.lib.nlp.steps.batched_step.BatchedStep) Modify raw query using metadata collected from prior steps. Parameters - `step` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)`, ``"app"`) – app - `type` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)`, ``"query_processing"`) – query_processing - `name` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)`, ``"query_modifier"`) – query_modifier - `raw_input_field` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)`, ``"query"`) – raw user query to modify - `term_mutations_metadata` ([`list`](https://docs.python.org/3.11/library/stdtypes.html#list)`, ``[``"term_expansion_mutations"``,``"pos_mutations"``]`) – mutations applied, order matters - `output_field` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)`, ``"enriched_query"`) – the modified query string - `path` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)`, ``"."`) – schema expects path where step file is located. not used actually Attributes SummaryMethods SummaryAttributes Documentation **`REMOVE_PUNCTUATION = '!"\\#\\$%\\&\'\\(\\)\\*\\+,\\-\\./:;<=>\\?@\\[\\\\\\]\\^_`\\{\\|\\}\\~'`** Methods Documentation **`static append_string(raw_query_string, mutations)`** Concatenate mutations (act as filter) with raw-query-string. **`process_doc(doc)`** Process a document Parameters `doc` ([`Document`](../technical/libnlp/base.md#squirro.lib.nlp.document.Document)) – Document Returns Processed document Return type [Document](../technical/libnlp/base.md#squirro.lib.nlp.document.Document) **`replace_by_key_value(raw_query_string, mutations)`** Apply mutations as defined from prior steps on raw_query_string. Return type [`str`](https://docs.python.org/3.11/library/stdtypes.html#str) **Note: The whole approach of mutation-dicts & regex-matching on the raw-query-string is not ideal.** Reason for that approach is to consider/keep to user’s original query syntax in place, like logical grouping clauses. user query: (phone AND apple) possible rewritten: (phone^10 AND (apple^5 OR “Apple Inc.”^0.7)