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35 lines
1.5 KiB
TeX
35 lines
1.5 KiB
TeX
\section{Standard Module \sectcode{regsub}}
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\stmodindex{regsub}
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This module defines a number of functions useful for working with
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regular expressions (see built-in module \code{regex}).
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Warning: these functions are not thread-safe.
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\renewcommand{\indexsubitem}{(in module regsub)}
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\begin{funcdesc}{sub}{pat\, repl\, str}
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Replace the first occurrence of pattern \var{pat} in string
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\var{str} by replacement \var{repl}. If the pattern isn't found,
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the string is returned unchanged. The pattern may be a string or an
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already compiled pattern. The replacement may contain references
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\samp{\e \var{digit}} to subpatterns and escaped backslashes.
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\end{funcdesc}
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\begin{funcdesc}{gsub}{pat\, repl\, str}
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Replace all (non-overlapping) occurrences of pattern \var{pat} in
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string \var{str} by replacement \var{repl}. The same rules as for
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\code{sub()} apply. Empty matches for the pattern are replaced only
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when not adjacent to a previous match, so e.g.
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\code{gsub('', '-', 'abc')} returns \code{'-a-b-c-'}.
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\end{funcdesc}
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\begin{funcdesc}{split}{str\, pat\optional{\, retain}}
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Split the string \var{str} in fields separated by delimiters matching
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the pattern \var{pat}, and return a list containing the fields. Only
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non-empty matches for the pattern are considered, so e.g.
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\code{split('a:b', ':*')} returns \code{['a', 'b']} and
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\code{split('abc', '')} returns \code{['abc']}.
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If the optional \var{retain} argument is true, the separators are also
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inserted in the list, so e.g. \code{split('a:::b', ':*', 1)} returns
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\code{['a', ':::', 'b']}.
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\end{funcdesc}
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