IsBase64 - Revision history

Egge at 03:02, 19 October 2009

2009-10-19T03:02:12Z

← Older revision		Revision as of 03:02, 19 October 2009
Line 23:		Line 23:
	def isBase64(s):		def isBase64(s):
	return (len(s) % 4 == 0) and re.match('^[A-Za-z0-9+/]+[=]{0,2}$', s)		return (len(s) % 4 == 0) and re.match('^[A-Za-z0-9+/]+[=]{0,2}$', s)
			</geshi>

			=== Regex ===
			In both of the above examples, I check the length, and then apply the regex. I think this makes it a bit more readable. However, it is possible to do the entire check with just a single regex.

			<geshi>
			^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==\|[A-Za-z0-9+/]{3}=)?$
	</geshi>		</geshi>

	[[Category:Java]]		[[Category:Java]]
	[[Category:Regex]]		[[Category:Regex]]

Egge at 02:18, 19 October 2009

2009-10-19T02:18:48Z

← Older revision		Revision as of 02:18, 19 October 2009
Line 16:		Line 16:
	Assert.assertFalse(RssFileUpload.isBase64("OMG!"));		Assert.assertFalse(RssFileUpload.isBase64("OMG!"));
	}		}
			</geshi>

			=== Python ===
			The same function in Python:
			<geshi lang="python">
			def isBase64(s):
			return (len(s) % 4 == 0) and re.match('^[A-Za-z0-9+/]+[=]{0,2}$', s)
	</geshi>		</geshi>

	[[Category:Java]]		[[Category:Java]]
	[[Category:Regex]]		[[Category:Regex]]

Egge: Created page with 'Test to determine if a string is [http://en.wikipedia.org/wiki/Base64 base64 encoded]. This check only shows if the string conforms to base64. It's possible that the string con…'

2009-10-19T00:23:32Z

Created page with 'Test to determine if a string is [http://en.wikipedia.org/wiki/Base64 base64 encoded]. This check only shows if the string conforms to base64. It's possible that the string con…'

New page

Test to determine if a string is [http://en.wikipedia.org/wiki/Base64 base64 encoded]. This check only shows if the string conforms to base64. It's possible that the string conforms, but is not in fact encoded.

<geshi lang="java5">
static boolean isBase64(String s) {
return (s.length() % 4 == 0) && s.matches("^[A-Za-z0-9+/]+[=]{0,2}$");
}
</geshi>

<geshi lang="java5">
@Test
public void testIsBase64() throws Exception {
Assert.assertTrue(RssFileUpload.isBase64("bGVhc3VyZS4="));
Assert.assertTrue(RssFileUpload.isBase64("ZWFzdXJlLg=="));
Assert.assertTrue(RssFileUpload.isBase64("YXN1cmUu"));
Assert.assertTrue(RssFileUpload.isBase64("c3VyZS4="));
Assert.assertFalse(RssFileUpload.isBase64("OMG!"));
}
</geshi>

[[Category:Java]]
[[Category:Regex]]