![]() Use raw string literals (Python r'\bworld\b'), C# verbatim string literals or slashy strings/regex literal notations like /world\./. will be declared as "world\\.", or use a character class: "world"). to match any char including a newline.īackslash note: In languages where you have to declare patterns with C strings allowing escape sequences (like \n for a newline), you need to double the backslashes escaping special characters so that the engine could treat them as literal characters (e.g. Make sure you use a corresponding DOTALL modifier ( /s in PCRE/Boost/.NET/Python/Java and /m in Ruby) for the. They are not necessary when testing individual strings.Īnchor note: In many languages, use \A to define the unambiguous start of string, and \z (in Python, it is \Z, in JavaScript, $ is OK) to define the very end of the string.ĭot note: In many flavors (but not POSIX, TRE, TCL). Use a negated character class: + (any char other than a lowercase ASCII letter)ĭemo note: the newline \n is used inside negated character classes in demos to avoid match overflow to the neighboring line(s). ![]()
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