Replace Occurrences of a Pattern
These functions replace, with the given replacement string, every/first/last
substring of the input that matches the specified pattern.
stri_replace_all(str, replacement, ..., regex, fixed, coll, charclass)
stri_replace_first(str, replacement, ..., regex, fixed, coll, charclass)
stri_replace_last(str, replacement, ..., regex, fixed, coll, charclass)
stri_replace(
str,
replacement,
...,
regex,
fixed,
coll,
charclass,
mode = c("first", "all", "last")
)
stri_replace_all_charclass(
str,
pattern,
replacement,
merge = FALSE,
vectorize_all = TRUE,
vectorise_all = vectorize_all
)
stri_replace_first_charclass(str, pattern, replacement)
stri_replace_last_charclass(str, pattern, replacement)
stri_replace_all_coll(
str,
pattern,
replacement,
vectorize_all = TRUE,
vectorise_all = vectorize_all,
...,
opts_collator = NULL
)
stri_replace_first_coll(str, pattern, replacement, ..., opts_collator = NULL)
stri_replace_last_coll(str, pattern, replacement, ..., opts_collator = NULL)
stri_replace_all_fixed(
str,
pattern,
replacement,
vectorize_all = TRUE,
vectorise_all = vectorize_all,
...,
opts_fixed = NULL
)
stri_replace_first_fixed(str, pattern, replacement, ..., opts_fixed = NULL)
stri_replace_last_fixed(str, pattern, replacement, ..., opts_fixed = NULL)
stri_replace_all_regex(
str,
pattern,
replacement,
vectorize_all = TRUE,
vectorise_all = vectorize_all,
...,
opts_regex = NULL
)
stri_replace_first_regex(str, pattern, replacement, ..., opts_regex = NULL)
stri_replace_last_regex(str, pattern, replacement, ..., opts_regex = NULL)str |
character vector; strings to search in |
replacement |
character vector with replacements for matched patterns |
... |
supplementary arguments passed to the underlying functions,
including additional settings for |
mode |
single string;
one of: |
pattern, regex, fixed, coll, charclass |
character vector; search patterns; for more details refer to stringi-search |
merge |
single logical value;
should consecutive matches be merged into one string;
|
vectorize_all |
single logical value;
should each occurrence of a pattern in every string
be replaced by a corresponding replacement string?;
|
vectorise_all |
alias of |
opts_collator, opts_fixed, opts_regex |
a named list used to tune up
the search engine's settings; see
|
By default, all the functions are vectorized over
str, pattern, replacement (with recycling
of the elements in the shorter vector if necessary).
Input that is not part of any match is left unchanged;
each match is replaced in the result by the replacement string.
However, for stri_replace_all*, if vectorize_all is FALSE,
the each substring matching any of the supplied patterns
is replaced by a corresponding replacement string.
In such a case, the vectorization is over str,
and - independently - over pattern and replacement.
In other words, this is equivalent to something like
for (i in 1:npatterns) str <- stri_replace_all(str, pattern[i], replacement[i].
Note that you must set length(pattern) >= length(replacement).
In case of stri_replace_*_regex,
the replacement string may contain references to capture groups
(in round parentheses).
References are of the form $n, where n is the number
of the capture group ($1 denotes the first group).
For the literal $,
escape it with a backslash.
Moreover, ${name} are used for named capture groups.
Note that stri_replace_last_regex searches from start to end,
but skips overlapping matches, see the example below.
stri_replace, stri_replace_all, stri_replace_first,
and stri_replace_last are convenience functions; they just call
stri_replace_*_* variants, depending on the arguments used.
If you wish to remove white-spaces from the start or end
of a string, see stri_trim.
All the functions return a character vector.
Other search_replace:
about_search,
stri_trim_both()
stri_replace_all_charclass('aaaa', '[a]', 'b', merge=c(TRUE, FALSE))
stri_replace_all_charclass('a\nb\tc d', '\\p{WHITE_SPACE}', ' ')
stri_replace_all_charclass('a\nb\tc d', '\\p{WHITE_SPACE}', ' ', merge=TRUE)
s <- 'Lorem ipsum dolor sit amet, consectetur adipisicing elit.'
stri_replace_all_fixed(s, ' ', '#')
stri_replace_all_fixed(s, 'o', '0')
stri_replace_all_fixed(c('1', 'NULL', '3'), 'NULL', NA)
stri_replace_all_regex(s, ' .*? ', '#')
stri_replace_all_regex(s, '(el|s)it', '1234')
stri_replace_all_regex('abaca', 'a', c('!', '*'))
stri_replace_all_regex('123|456|789', '(\\p{N}).(\\p{N})', '$2-$1')
stri_replace_all_regex(c('stringi R', 'REXAMINE', '123'), '( R|R.)', ' r ')
## Not run:
# named capture groups available since ICU 55
stri_replace_all_regex('words 123 and numbers 456',
'(?<numbers>[0-9]+)', '!${numbers}!')
## End(Not run)
# Compare the results:
stri_replace_all_fixed('The quick brown fox jumped over the lazy dog.',
c('quick', 'brown', 'fox'), c('slow', 'black', 'bear'), vectorize_all=TRUE)
stri_replace_all_fixed('The quick brown fox jumped over the lazy dog.',
c('quick', 'brown', 'fox'), c('slow', 'black', 'bear'), vectorize_all=FALSE)
# Compare the results:
stri_replace_all_fixed('The quicker brown fox jumped over the lazy dog.',
c('quick', 'brown', 'fox'), c('slow', 'black', 'bear'), vectorize_all=FALSE)
stri_replace_all_regex('The quicker brown fox jumped over the lazy dog.',
'\\b'%s+%c('quick', 'brown', 'fox')%s+%'\\b', c('slow', 'black', 'bear'), vectorize_all=FALSE)
# Searching for the last occurrence:
# Note the difference - regex searches left to right, with no overlaps.
stri_replace_last_fixed("agAGA", "aga", "*", case_insensitive=TRUE)
stri_replace_last_regex("agAGA", "aga", "*", case_insensitive=TRUE)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.