I'm starting to learn kotlin. How can you count the number of occurrences of a substring in a string?

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1avalanche2020-10-16 23:14:40

Kotlin

1avalanche, 2020-10-16 23:14:40

You need to count the number (how many times) a substring (it can be a word, letter, symbols) is included in the string. Perhaps this can be done somehow using regular expressions?

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