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from pyspark.sql import functions as F
df.withColumn("product1_num", F.regexp_extract("productname", "([0-9]+)",1)).show()
+------+-------------------+------------+
| id| productname|product1_num|
+------+-------------------+------------+
|234832|EXTREME BERRY SAUCE| |
|419836| BLUE KOSHER SAUCE| |
|350022| GUAVA (1G)| 1|
|123213| GUAVA G5| 5|
|125513| 3GULA G5| 3|
|127143| GUAVA G50| 50|
|124513| LAAVA C2L5| 2|
+------+-------------------+------------+