Match Pattern

Video

What is match pattern?

Match pattern is found in the TextChunk object. The match_pattern tool enables you to create a pattern (either Token Pattern or Dependency Pattern) and extract your data from your document or sentence.

If you are looking for more about matching patterns check out our documentation 👨🏻‍💻

Importing the library & your personal API key

After you've installed the Lettria package on Python you'll need to import the library.

import lettria

Next you are going to need to include your personal API key which can be found via the Lettria platform in the dashboard.

api_key = 'your personal API key'
nlp = lettria.NLP(api_key)

Adding a pattern

In order to use match pattern you must first create the pattern.

patterns = {
    "service":
        [
            {
            "LEMMA": {"IN":["good", "average", "poor"]}
             },
        ]
}

This is a simple example of a token pattern. I have added the Lemma attribute and the IN modifier. You can also create a dependency pattern to use the match_pattern tool.

Adding data

Next add the data you would like to analyze. I am going to add text but you can also upload a saved file with the with open command.

example_data = “example text”

Next add the data to the NLP.

nlp.add_document(example_data)

Extracting patterns

To extract the pattern from the text I will use the following command

for doc, matches in nlp. match_pattern(patterns, level = None, print_tree=False, skip_errors=False):
    print(matches)

In the return you will have a list of the corresponding token or dependency patterns you have defined.

Saving your results

In order to save your results you can use the following command.

nlp.save_results(‘example_results')

And a json file with your results that can be used for further analysis will be saved.

Code set

import lettria

api_key = 'your personal API key'
nlp = lettria.NLP(api_key)

patterns = {
    "service":
        [
            {
            "LEMMA": {"IN":["good", "average", "poor"]}
             },
        ]
}

example_data = “example text”
nlp.add_document(example_data)

for doc, matches in nlp. match_pattern(patterns, level = None, print_tree=False, skip_errors=False):
    print(matches)

nlp.save_results(‘example_results')