Rosetta Code:Village Pump/Suggest a programming task: Difference between revisions
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=== Generate a Regular Expression for a Range of Integers === |
=== Generate a Regular Expression for a Range of Integers === |
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Write a function that, given the integers 0 <= min < = max, returns a regular expression that will match the decimal representation of any integer in the range [min, max]. You may assume there are no thousand-separators, leading 0's, or other problematic characters in the string to be processed. You may also assume the caller of your function will prepend/append appropriate anchors (e.g., ^, $, or \b) depending on need, so don't include them. Don't use \d as an alias for [0-9] since \d can match weird unicode characters on some systems. |
Write a function that, given the integers 0 <= ''min'' < = ''max'', returns a regular expression that will match the decimal representation of any integer in the range [''min'', ''max'']. You may assume there are no thousand-separators, leading 0's, or other problematic characters in the string to be processed. You may also assume the caller of your function will prepend/append appropriate anchors (e.g., ^, $, or \b) depending on need, so don't include them. Don't use \d as an alias for [0-9] since \d can match weird unicode characters on some systems. |
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Example: |
Example: |
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min = 1 |
min = 1 |
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max = 31 |
max = 31 |
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possible result = [1-9]|[1-2][0-9]|3[0-1] |
possible result = [1-9]|[1-2][0-9]|3[0-1] |
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possible result = [1-9]|[12][0-9]|3[01] |
possible result = [1-9]|[12][0-9]|3[01] |
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Example: |
Example: |
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min = 91 |
min = 91 |
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max = 417 |
max = 417 |
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possible result = 9[1-9]|[1-3][0-9]{2}|4(0[0-9]|1[0-7]) |
possible result = 9[1-9]|[1-3][0-9]{2}|4(0[0-9]|1[0-7]) |
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possible result = 9[1-9]|[1-3][0-9][0-9]|4(0[0-9]|1[0-7]) |
possible result = 9[1-9]|[1-3][0-9][0-9]|4(0[0-9]|1[0-7]) |
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