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Ilya Kantor 2019-06-25 16:25:50 +03:00
parent 69fbb63bc4
commit 4f2a90854d
4 changed files with 33 additions and 26 deletions
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9-regular-expressions/09-regexp-groups/3-find-decimal-positive-numbers/solution.md
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An non-negative integer number is `pattern:\d+`. We should exclude `0` as the first digit, as we don't need zero, but we can allow it in further digits.
An non-negative integer number is `pattern:\d+`. A zero `0` can't be the first digit, but we should allow it in further digits.
So that gives us `pattern:[1-9]\d*`.
A decimal part is: `pattern:\.\d+`.
Because the decimal part is optional, let's put it in parentheses with the quantifier `pattern:'?'`.
Because the decimal part is optional, let's put it in parentheses with the quantifier `pattern:?`.
Finally we have the regexp: `pattern:[1-9]\d*(\.\d+)?`: