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String operations trade space for time. Don't repeatedly concatenate onto the end of a string. Build up its individual parts in a table and use table.concat (). * by the reciprocal is faster than /. return and break can only occur at the end of a block. There's no continue. There's no goto. next is a global variable, not a keyword. By default ...
Note: Lua patterns are not regular expressions in the traditional POSIX sense, and they are not even a subset of regular expressions. But they share many constructs with regular expressions (more below). Lua patterns are used to define, find and handle a pattern in a string. It can do the common search and replace action in a text, but it has ...
Invalid concatenation of empty string: my_str = my_str .. "xx" - The string named 'my_str' must not be nil when used inside a string concatenation operation. Invalid concatenation by "+" not ".." operator: my_str = my_str + "z" - The concatenation operator is double-dot ".." and trying to use a plus-sign "+" might pass during the pre-compile of ...
However, removing the feature breaks backwards compatibility, and replacing it with a concatenation operator introduces issues of precedence – string literal concatenation occurs during lexing, prior to operator evaluation, but concatenation via an explicit operator occurs at the same time as other operators, hence precedence is an issue ...
Regular expressions (or regex) are a common and very versatile programming technique for manipulating strings. On Wikipedia you can use a limited version of regex called a Lua pattern to select and modify bits of text from a string. The pattern is a piece of code describing what you are looking for in the string.
Both Lua and templates like {{first character}} can identify strings beginning with : without any trouble, but when they are output from a template or a parser function (including #invoke), the parser adds an extra newline.
A spreadsheet's concatenate ("&") function is used to assemble a complex text string—in this example, XML code for an SVG "circle" element. In formal language theory and computer programming, string concatenation is the operation of joining character strings end-to-end. For example, the concatenation of "snow" and "ball" is "snowball".
Lua is a programming language that is available via the ... concatenate a bunch of strings together to produce-- a sentence based on the arguments given. end ...