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They mean that the previous character can be repeated n times, where for each symbol n ≥ 0, n > 0, n is zero or one, and n ≥ 0 again respectively. (The difference with -is that it is "non-greedy", it matches as few symbols as possible given the rest of the pattern.) ^ means the start of the string, and $ means the end.
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Space normalization is a related string manipulation where in addition to removing surrounding whitespace, any sequence of whitespace characters within the string is replaced with a single space. Space normalization is performed by the function named Trim() in spreadsheet applications (including Excel , Calc , Gnumeric , and Google Docs ), and ...
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This template removes the first word of the first parameter. Use |1= for the first parameter if the string may contain an equals sign (=). By default, words are delimited by spaces, but the optional parameter |sep= can set the separator to any character.
The template trims whitespace from a string. Template parameters [Edit template data] Parameter Description Type Status String 1 The string to be trimmed of whitespace String required See also {{ remove border }}
Returns string with the first n occurrences of target replaced with replacement. Omitting count will replace all occurrences. Space counts as a character if placed in any of the first three parameters.
A template to give the <count> substring of characters from the start of the trimmed string Template parameters [Edit template data] Parameter Description Type Status String 1 The string to be trimmed and counted String required Count 2 Gives the <count> substring of characters from the start of the trimmed string Number required See also Bugzilla:22555 (historical; need for correcting padleft ...