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20.1 – Pattern-Matching Functions. The most powerful functions in the string library are string.find (string Find), string.gsub (Global Substitution), and string.gfind (Global Find). They all are based on patterns.
- Programming in Lua
This is the online version of the first edition of the book...
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Both string.upper and string.lower follow the current...
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Pattern matching is a powerful tool for manipulating...
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A character class is an item in a pattern that can match any...
- Programming in Lua
1 paź 2015 · There are 2 options to find matching text; string.match or string.find. Both of these perform a Lua patten search on the string to find matches. string.find() string.find(subject string, pattern string, optional start position, optional plain flag) Returns the startIndex & endIndex of the substring found.
string.match("f123", "%D") --> f In addition to character classes, some characters have special functions as patterns: The character % represents a character escape, making %? match an interrogation and %% match the percentage symbol.
Pattern matching is a powerful tool for manipulating strings. You can perform many complex operations with only a few calls to string.gsub and find. However, as with any power, you must use it carefully. Pattern matching is not a replacement for a proper parser.
A character class is an item in a pattern that can match any character in a specific set. For instance, the class %d matches any digit. Therefore, you can search for a date in the format dd/mm/yyyy with the pattern ' %d%d/%d%d/%d%d%d%d ': s = "Deadline is 30/05/1999, firm" date = "%d%d/%d%d/%d%d%d%d"
What if you want to get certain pieces out of a string of text? This can be done by wrapping parts of a pattern in ( ), and the contents of each of these captures will be returned from string.match. > = string.match ("foo: 123 bar: 456", '(%a+):%s*(%d+)%s+(%a+):%s*(%d+)') -- %a: letter %s: whitespace foo 123 bar 456
30 sie 2024 · string.match - Lua Commands. SYNOPSIS. string.match(s,pattern[,init]) DESCRIPTION. Looks for the first match of pattern in the string s. If it finds one, then match returns the captures from the pattern; otherwise it returns nil. If pattern specifies no captures, then the whole match is returned.
