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Regular
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101
Regular
Expressions
101
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Regular Expression
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^(\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)$
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gm
Test String
New
^( \d\d[2468][048]|\d\d[13579][26]|\d\d0[48]| # multiple of four but not 100 [02468][048]00 |[13579][26]00 # multiple of four hundred ) // accept: multiple of four () 0004 0008 0012 0016 0020 0024 0028 0032 0036 0040 0044 0048 0052 0056 0060 0064 0068 0072 0076 0080 0084 0088 0092 0096 1560 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 9996 // accept: Multiple of 400 0000 0400 0800 1200 1600 2000 2400 2800 3200 3600 4000 4400 4800 5200 5600 6000 6400 6800 7200 7600 8000 8400 8800 9200 9600 // REJECT: Not a multiple of four 0101 0102 0103 1537 1538 2001 2002 2003 2021 2022 2023 2025 2026 2027 2029 2030 2031 2033 2034 2035 2037 2038 2039 2041 2042 2043 9997 9998 9999 // REJECT: Multiple of 100 but not 400 0100 0200 0300 0500 0600 0700 0900 1000 1100 1500 2100 2200 2300 2500 2600 2700 2900 3000 3100 3300 3400 3500 3700 // REJECT: Negative dates not accepted (malformed) -2000 -0400 -0100 -0004 // REJECT: Out of range date per RFC 3339 10000
Substitution
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