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#
https://bookdown.org/rdpeng/rprogdatascience/regular-expressions.html
#
the Stringr package comes with fruit, words and sentences which later was known.
#
REGULAR EXPRESSIONS
#
search for matches/ patterns
#
grep() | grepl()
#
search a vector for matches, returns index of string
#
regexpr() | gregexpr()
#
search a vector for matches & replaces it
#
sub() | gsub()
#
search a vector returns location of any expression
#
regexec()
#
df = readLines("fileName.txt)
#
w = grep("rainbow", df)
#
w = grep("rainbow | rainbows", df)
#
w = grep("Community: [2S]LGBTQ", df)
#
======== grep words with context !
#
p = grep("Community: [2S]LGBTQ")
#
s = grep("[Ss]unday", df) # compare
#
z = grep("[Cc]ummunirt", df)
#
find difference
#
setdiff(s, z)
#
setdiff(z,s) # returns x
#
df[x]
library(
tidyverse
)
df
=
starwars
grep(
"
^Darth
"
,
df
$
name
)
#
return index
grep(
"
^Darth
"
,
df
$
name
,
value
=
T
)
#
returns strings
r
=
regexpr(
"
[Hh]uman*
"
,
df
$
species
[
1
:
10
])
regmatches(
df
$
species
[
1
:
10
],
r
)
x
=
df
$
name
[
3
]
d
=
gsub(
"
R2-D2
"
,
"
R2-Dx
"
,
x
)
d
#
============= stringr pkg
#
df, "expression", option
l
=
str_subset(
df
$
name
,
"
Luke
"
)
length(
l
)
str_detect(
df
$
name
,
"
Darth
"
)
str_extract(
df
$
name
,
"
Darth
"
)
darth
=
str_match(
df
$
name
,
"
Darth
"
)
darth
[
4
]
darth
[
42
]
#
========= stringr documentation
x
=
c(
"
Saturday
"
,
"
cannabis
"
,
"
relaxing
"
,
'
Jazz
'
,
'
cool
'
,
'
CLIMATE
'
,
'
EMERG
'
,
'
loveR
'
)
str_length(
x
)
#
counts length of each word 8 8 8 4 4 7 5 5
str_c(
x
,
collapse
=
"
-
"
)
#
"Saturday-cannabis-relaxing-Jazz-cool"
str_sub(
x
,
start
=
1
,
end
=
3
)
#
"Sat" "can" "rel" "Jaz" "coo"
#
regular expressions
str_subset(
x
,
"
[aeiou]
"
)
str_subset(
x
,
"
[a]x
"
)
#
"relaxing"
str_count(
x
,
"
[aeiou]
"
)
#
3 3 3 1 2 0 0 2
#
--- 7 main verbs for patterns
#
1
str_detect(
x
,
"
[aeiou]
"
)
#
TRUE TRUE TRUE TRUE TRUE FALSE FALSE TRUE
#
2
str_count(
x
,
"
[ae]
"
)
#
2 2 2 1 0 0 0 1
#
3
str_subset(
x
,
"
[em]
"
)
#
"relaxing" "loveR"
#
4
str_locate(
x
,
"
[aeiou]
"
)
#
returns a matrix
#
5
str_extract(
x
,
"
[aeiou]
"
)
#
"a" "a" "e" "a" "o" NA NA "o"
#
6
str_match(
x
,
"
(.)[aeiou](.)
"
)
#
returns matrix vowels removed
#
7
str_replace(
x
,
"
[aeiou]
"
,
"
?
"
)
#
"S?turday" "c?nnabis" "r?laxing" "J?zz" "c?ol" "CLIMATE" "EMERG" "l?veR"
#
-----------------
str_to_upper(
x
)
str_to_lower(
x
)
str_to_title(
x
)
str_to_sentence(
x
)
str_c(
"
Letter
"
,
letters
,
sep
=
"
:
"
)
fruit
=
c(
"
apple
"
,
"
cherry
"
,
"
Mango
"
,
'
pineapple
'
,
'
pear
'
,
'
bananas
'
,
'
grapes
'
)
str_count(
fruit
,
'
p
'
)
str_detect(
fruit
,
"
^a
"
)
str_detect(
fruit
,
"
a$
"
)
str_dup(
fruit
,
2
)
#
"appleapple" "cherrycherry" ...
str_dup(
fruit
,
1
:
7
)
#
... "MangoMangoMango" ...
str_extract(
fruit
,
"
[a-z]
"
)
#
a" "c" "a" "p" "p" "b" "g"
str_extract(
fruit
,
"
[a-z]{1,9}
"
)
str_extract(
fruit
,
"
[A-Z]{1,9}
"
)
str_flatten(
fruit
,
collapse
=
"
-
"
)
species
=
"
Humanoid
"
stardate
=
Sys.Date()
str_glue(
"
you are a {species}
"
,
"
on this date: {stardate}
"
)
str_length(c(
"
I
"
,
'
love
'
,
'
R
'
))
str_locate(
fruit
,
"
[Mm]ango
"
)
#
start end
#
[1,] NA NA
#
[2,] NA NA
#
[3,] 1 5
str_locate(
fruit
,
'
$
'
)
str_locate(
fruit
,
'
a
'
)
str_locate(
fruit
,
'
e
'
)
str_locate_all(
fruit
, c(
'
a
'
,
'
b
'
,
'
p
'
,
'
p
'
))
str_match(
fruit
,
"
berry
"
)
phonebook
=
c(
'
304-222-9080
'
,
'
908-132-3322
'
,
'
482 897 6547
'
,
'
239-923-8771
'
,
'
$1000
'
,
'
Fax: 303.405.7799
'
)
phone
=
"
([2-9][0-9]{2}[- .]([0-9]{3})[- .]([0-9]{4}))
"
str_extract(
phonebook
,
phone
)
str_extract_all(
phonebook
,
phone
)
str_order(
letters
)
str_sort(
letters
)
x
=
c(
"
100
"
,
'
321
'
,
'
90
'
)
str_sort(
x
,
numeric
=
T
,
decreasing
=
F
)
str_pad(
"
rainbow
"
,
width
=
30
,
side
=
'
left
'
,
pad
=
"
-
"
)
#
"-----------------------rainbow"
str_pad(
"
rainbow
"
,
width
=
30
,
side
=
'
right
'
,
pad
=
"
-
"
)
#
"rainbow-----------------------"
str_pad(
"
rainbow
"
,
width
=
30
,
side
=
'
both
'
,
pad
=
"
-
"
)
#
"-----------rainbow------------"
bag
=
c(
'
2 apples
'
,
'
4 milks
'
,
'
6 bananas
'
)
str_remove(
bag
,
"
[aeiou]
"
)
#
"2 pples" "4 mlks" "6 bnanas"
str_remove_all(
bag
,
"
[aeiou]
"
)
#
"2 ppls" "4 mlks" "6 bnns"
str_replace(
bag
,
pattern
=
"
[aeiou]
"
,
replacement
=
"
*
"
)
str_replace_all(
bag
,
pattern
=
"
[aeiou]
"
,
replacement
=
"
*
"
)
str_replace(
bag
,
pattern
=
"
[aeiou]
"
,
replacement
=
toupper
)
str_replace_all(
bag
,
pattern
=
"
[aeiou]
"
,
replacement
=
"
_
"
)
str_split(
bag
,
"
and
"
)
str_split(
fruit
,
"
and
"
,
simplify
=
T
)
str_starts(
fruit
,
pattern
=
"
p
"
,
negate
=
F
)
fruit
[
55
:
65
]
words
=
"
Rainbows & Unicorns
"
str_sub(
words
,
start
=
3
,
end
=
13
)
str_sub(
words
,
start
=
c(
1
:
5
),
end
=
c(
7
:
11
))
x
<-
"
BBCDEF
"
str_sub(
x
,
1
,
1
)
<-
"
A
"
;
x
str_sub(
x
,
-
1
,
-
1
)
<-
"
K
"
;
x
str_sub(
x
,
-
2
,
-
2
)
<-
"
GHIJ
"
;
x
str_sub(
x
,
2
,
-
2
)
<-
"
"
;
x
str_subset(
fruit
,
"
a
"
)
str_which(
fruit
,
'
a
'
)
#
return integers
#
Returns elements that do NOT match
str_subset(
fruit
,
"
^p
"
,
negate
=
TRUE
)
str_which(
fruit
,
"
^p
"
,
negate
=
T
)
whitespace
=
"
hey, we got lots of s p a c e here
"
str_trim(
whitespace
,
side
=
'
both
'
)
str_squish(
whitespace
)
#
simpler and better
str_trunc(
whitespace
,
width
=
20
,
side
=
'
right
'
)
str_view( c(
'
abc
'
,
'
fgh
'
,
'
jkl
'
),
"
[aeiou]
"
)
sentence_
=
c(
"
Jane saw how wonderful the Chimpanzees were
"
,
"
Jane documented all of her work
"
,
"
Alexa was not available
"
)
word(
sentence_
,
start
=
1
)
#
"Jane" "Jane" "Alexa"
word(
sentence_
,
start
=
2
,
end
=
-
2
)
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