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For function that manipulate strings, modern object-oriented languages, like C# and Java have immutable strings and return a copy (in newly allocated dynamic memory), while others, like C manipulate the original string unless the programmer copies data to a new string.
Regular Expression Flavor Comparison – Detailed comparison of the most popular regular expression flavors; Regexp Syntax Summary; Online Regular Expression Testing – with support for Java, JavaScript, .Net, PHP, Python and Ruby; Implementing Regular Expressions – series of articles by Russ Cox, author of RE2; Regular Expression Engines
For each case, either side of the equals sign "=" can be a simple string, a call to a parser function (including #expr to evaulate expressions), or a template call. If any cases are not associated with a value (i.e., no equals sign is used), the next specified value will be used.
Boost-templtes differs from hastemplate in the default namespace; gramar. Boost-templates has a plural form, and uses a dash between the words. syntax. Boost-templates requires quotation marks. function. Hastemplate is a filter, but boost-templates is not; it only changes a score. Boost-template has a parameter for controlling the boost.
A classic example of a problem which a regular grammar cannot handle is the question of whether a given string contains correctly nested parentheses. (This is typically handled by a Chomsky Type 2 grammar, also termed a context-free grammar .)
Some other programming languages have varying case sensitivity; in PHP, for example, variable names are case-sensitive but function names are not case-sensitive. This means that if a function is defined in lowercase, it can be called in uppercase, but if a variable is defined in lowercase, it cannot be referred to in uppercase.
Boost-templtes differs from hastemplate in the default namespace; gramar. Boost-templates has a plural form, and uses a dash between the words. syntax. Boost-templates requires quotation marks. function. Hastemplate is a filter, but boost-templates is not; it only changes a score. Boost-template has a parameter for controlling the boost.
This article deals with three ways to compare string (equality, compare, and strcmp). This might have some issues: From my understanding, the three ones cover the same feature. This feature is not defined as long as lexicographical order is not defined. It is not clear if this comparison is a low level comparison, or on an equivalence basis.