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Ruby replace string with captured regex pattern

... Note that this only works if the replacement string is inside single quotes. I wasted 5 minutes figuring that out. – Vicky Chijwani Feb 9 '13 at 0:30 ...
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Troubleshooting “Illegal mix of collations” error in mysql

... two strings of incompatible collation or by attempting to select data of different collation into a combined column. The clause COLLATE allows you to specify the collation used in the query. For example, the following WHERE clause will always give the error you posted: WHERE 'A' COLLATE latin1_g...
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Renaming a virtualenv folder without breaking it

...table option. From the docs: Normally environments are tied to a specific path. That means that you cannot move an environment around or copy it to another computer. You can fix up an environment to make it relocatable with the command: $ virtualenv --relocatable ENV NOTE: EN...
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Why do we usually use || over |? What is the difference?

... If you use the || and && forms, rather than the | and & forms of these operators, Java will not bother to evaluate the right-hand operand alone. It's a matter of if you want to short-circuit the evaluation or not...
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How to tell if node.js is installed or not

...ind further instructions. What does one really need to do? I wanted to see if it was actually working. So I executed a script called hello.js. It went as such: ...
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Difference between \A \z and ^ $ in Ruby regular expressions

... If you're depending on the regular expression for validation, you always want to use \A and \z. ^ and $ will only match up until a newline character, which means they could use an email like me@example.com\n<script>dang...
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How to find common elements from multiple vectors?

...ect(a,b),c) will do the job. EDIT: More cleverly, and more conveniently if you have a lot of arguments: Reduce(intersect, list(a,b,c)) share | improve this answer | foll...
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How to convert list to string [duplicate]

... By using ''.join list1 = ['1', '2', '3'] str1 = ''.join(list1) Or if the list is of integers, convert the elements before joining them. list1 = [1, 2, 3] str1 = ''.join(str(e) for e in list1) share | ...
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Negative list index? [duplicate]

... However, there is a caveat: the behavior is slightly different if you try slice notation. If you use -1 in that case, it returns one element from the last. >>> a = [1,2,3,4,5] >>> a[-1] 5 >>> a[:-1] [1, 2, 3, 4] ...
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How do I update a Python package?

... You might want to look into a Python package manager like pip. If you don't want to use a Python package manager, you should be able to download M2Crypto and build/compile/install over the old installation. share...