pyspark.sql.functions.regexp_extract¶
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pyspark.sql.functions.regexp_extract(str, pattern, idx)[source]¶ Extract a specific group matched by a Java regex, from the specified string column. If the regex did not match, or the specified group did not match, an empty string is returned.
New in version 1.5.0.
Examples
>>> df = spark.createDataFrame([('100-200',)], ['str']) >>> df.select(regexp_extract('str', r'(\d+)-(\d+)', 1).alias('d')).collect() [Row(d='100')] >>> df = spark.createDataFrame([('foo',)], ['str']) >>> df.select(regexp_extract('str', r'(\d+)', 1).alias('d')).collect() [Row(d='')] >>> df = spark.createDataFrame([('aaaac',)], ['str']) >>> df.select(regexp_extract('str', '(a+)(b)?(c)', 2).alias('d')).collect() [Row(d='')]