Actually, your second attempt works for me in bash 3 and 4: However, to talk theory for a second, it all has to do with how bash interprets the expression as a whole. As long as the regular-expression characters themselves aren’t quoted, the rest of the expression can be quoted without side-effects: but perhaps the … Read more
Using regular expressions is probably the best way. You can see a bunch of tests here (taken from chromium) Here’s the example of regular expresion that accepts unicode: But keep in mind that one should not rely only upon JavaScript validation. JavaScript can easily be disabled. This should be validated on the server side as well. Here’s an example of … Read more
Use to make the letter optional. {1} is redundant. (Of course you could also write [A-Z]{0,1} which would mean the same, but that’s what the ? is there for.) You could improve your regex to And, since in most regex dialects, \d is the same as [0-9]: But: do you really need 11 separate capturing groups? And if so, why don’t you capture the … Read more
Here’s yet another way (using a negative look-ahead): Note: There’s only one capturing expression: ([a-z0-9]+).
Don’t use String.replaceAll in this case – that’s specified in terms of regular expressions, which means you’d need even more escaping. This should be fine: Note that the backslashes are doubled due to being in Java string literals – so the actual strings involved here are “single backslash” and “double backslash” – not double and quadruple. replace works on simple … Read more
The caret in the character class ([^) means match anything but, so this means, beginning of string, then one or more of anything except < and >, then the end of the string.
I need a way of searching a file using grep via a regular expression from the Unix command line. For example when I type in the command line: I need the regular expression ‘RE’ to be searched in the file and print out the matching lines. Here’s the code I have: But when I enter a word … Read more
. is any char, * means repeated zero or more times.
str.replace() v2|v3 does not recognize regular expressions. To perform a substitution using a regular expression, use re.sub() v2|v3. For example: In a loop, it would be better to compile the regular expression first:
1066 Regular expressions are used for Pattern Matching. To use in Excel follow these steps: Step 1: Add VBA reference to “Microsoft VBScript Regular Expressions 5.5” Select “Developer” tab (I don’t have this tab what do I do?) Select “Visual Basic” icon from ‘Code’ ribbon section In “Microsoft Visual Basic for Applications” window select “Tools” from … Read more