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b
y
t
h
e
s
u
cc
es
s
o
f
t
h
e
Hib
er
n
ate
C
r
iter
ia
A
P
I
[
6
-
8
]
to
s
tan
d
ar
d
ize
all
ag
g
r
e
g
atio
n
s
,
tr
a
n
s
f
o
r
m
atio
n
s
,
r
ed
u
ctio
n
s
,
r
estrictio
n
s
an
d
all
p
r
o
j
ec
tio
n
s
th
a
t
d
ev
elo
p
er
s
m
u
s
t
i
m
p
le
m
e
n
t
w
h
ile
u
s
i
n
g
a
r
eg
u
lar
ex
p
r
ess
i
o
n
.
A
l
l
p
r
o
g
r
a
m
m
i
n
g
la
n
g
u
a
g
es
h
a
v
e
A
P
I
s
f
o
r
p
r
o
ce
s
s
in
g
r
eg
u
lar
e
x
p
r
ess
io
n
s
[
5,
9]
,
b
u
t
n
o
A
P
I
h
as
p
r
o
v
id
ed
f
o
r
th
e
alr
ea
d
y
m
en
t
io
n
ed
p
r
o
ce
s
s
in
g
.
Fo
r
th
i
s
r
ea
s
o
n
,
s
ev
er
al
r
esear
ch
er
s
h
av
e
d
o
n
e
w
o
r
k
to
co
m
p
lete
th
e
lack
o
f
A
P
I
s
cu
r
r
en
tl
y
o
f
f
er
ed
b
y
p
r
o
g
r
am
m
in
g
l
a
n
g
u
a
g
es.
Sp
is
h
a
k
E
p
r
o
p
o
s
ed
an
an
n
o
tatio
n
-
b
ased
A
P
I
to
h
elp
t
h
e
d
ev
elo
p
er
f
in
d
t
h
e
er
r
o
r
s
o
f
r
eg
u
lar
e
x
p
r
ess
io
n
s
d
u
r
in
g
th
e
co
m
p
ilatio
n
p
h
ase
o
f
a
p
r
o
g
r
am
[
1
0
]
.
Oth
er
w
o
r
k
s
ai
m
ed
at
h
elp
in
g
th
e
d
e
v
el
o
p
er
to
s
im
p
li
f
y
,
v
alid
ate
o
r
au
to
m
atica
ll
y
g
e
n
er
ate
r
eg
u
lar
ex
p
r
ess
io
n
s
[2
-
4]
.
A
ll
f
ea
t
u
r
es
b
u
il
t
in
to
o
u
r
R
eg
e
x
C
r
iter
ia
A
P
I
w
il
l b
e
illu
s
tr
ate
d
b
y
e
x
a
m
p
les
i
m
p
le
m
e
n
ted
u
s
i
n
g
t
h
e
J
av
a
l
an
g
u
a
g
e
s
y
n
ta
x
.
T
h
is
p
ap
er
is
o
r
g
an
ized
as
f
o
llo
w
s
.
Sectio
n
2
tell
s
ab
o
u
t
t
h
e
h
i
s
to
r
y
o
f
r
e
g
u
lar
ex
p
r
ess
i
o
n
an
d
its
s
y
m
b
o
ls
.
Sectio
n
3
p
r
esen
ts
t
w
o
p
r
o
g
r
a
m
s
u
s
i
n
g
t
h
e
r
eg
u
la
r
ex
p
r
ess
io
n
s
.
A
s
f
o
r
s
ec
tio
n
4
,
it
talk
s
ab
o
u
t
th
e
li
m
ita
tio
n
s
o
f
cu
r
r
en
t
A
P
I
d
e
alin
g
w
ith
t
h
e
r
eg
u
lar
ex
p
r
ess
io
n
s
.
R
e
lated
w
o
r
k
s
ar
e
illu
s
tr
ated
at
Sectio
n
5
.
Sectio
n
6
b
r
ief
l
y
d
escr
ib
e
s
o
m
e
f
ea
tu
r
es
o
f
R
e
g
e
x
C
r
iter
ia
A
P
I
.
T
h
e
last
s
ec
tio
n
co
n
ta
i
n
s
f
i
n
al
co
n
cl
u
s
io
n
s
an
d
p
o
in
ts
to
f
u
r
th
er
w
o
r
k
.
2.
T
H
E
R
E
G
UL
A
R
E
XP
R
E
S
S
I
O
N
A
r
e
g
u
lar
ex
p
r
ess
io
n
i
s
a
s
tr
i
n
g
o
f
te
x
t
t
h
at
d
e
f
in
e
s
t
h
e
f
o
r
m
at
o
f
a
s
et
o
f
s
tr
i
n
g
s
(
e
m
a
il
f
o
r
m
a
t,
p
h
o
n
e
n
u
m
b
er
f
o
r
m
at,
I
P
ad
d
r
ess
f
o
r
m
at,
etc.
)
.
R
eg
u
lar
e
x
p
r
ess
io
n
s
ar
e
u
s
ef
u
l
f
o
r
f
i
n
d
in
g
p
atter
n
s
i
n
s
tr
i
n
g
s
an
d
p
o
s
s
ib
l
y
r
ep
lacin
g
th
e
m
w
it
h
a
n
o
th
er
p
atter
n
.
Si
n
ce
"
r
eg
u
lar
e
x
p
r
ess
io
n
s
"
is
a
m
o
u
t
h
f
u
l,
w
e
w
il
l
u
s
u
all
y
u
s
e
t
h
e
ter
m
ab
b
r
ev
iated
"
r
eg
ex
"
.
I
n
th
e
n
ex
t
s
ec
tio
n
w
e
will
b
r
ief
l
y
d
is
c
u
s
s
th
e
s
to
r
y
b
e
h
in
d
t
h
e
p
o
p
u
lar
it
y
o
f
r
eg
ex
.
2
.
1
.
Reg
ula
r
ex
pres
s
io
n hi
s
t
o
ry
T
h
e
id
ea
o
f
r
eg
u
lar
ex
p
r
ess
i
o
n
s
w
as
d
is
co
v
er
ed
b
y
W
ar
r
en
Mc
C
u
llo
ch
a
n
d
W
alter
P
itts
in
1
9
4
3
th
r
o
u
g
h
t
h
e
p
u
b
lica
tio
n
o
f
th
e
ir
ar
ticle
"
A
lo
g
ica
l
ca
lc
u
latio
n
o
f
id
ea
s
i
m
m
an
e
n
t
to
n
er
v
o
u
s
ac
ti
v
it
y
"
i
n
th
e
B
u
lleti
n
o
f
Ma
t
h
e
m
a
tical
b
io
p
h
y
s
ics
[
1
1
]
.
I
n
1
9
5
6
,
th
e
m
ath
e
m
aticia
n
S
tep
h
e
n
Klee
n
e
d
ev
elo
p
ed
a
m
o
d
el
th
at
p
r
ese
n
ts
a
s
i
m
p
le
al
g
eb
r
a
in
t
h
e
ar
ticle
"
R
ep
r
esen
tati
o
n
o
f
ev
e
n
t
s
i
n
n
et
w
o
r
k
s
o
f
n
er
v
es
a
n
d
f
i
n
ite
au
to
m
ata"
[1
2]
.
A
t
th
at
ti
m
e
th
e
ter
m
s
r
eg
u
lar
s
et
s
an
d
r
eg
u
lar
ex
p
r
es
s
io
n
s
w
e
r
e
b
o
r
n
.
I
n
1
9
6
8
,
Ken
T
h
o
m
p
s
o
n
p
u
b
lis
h
ed
t
h
e
ar
ticle
"
R
eg
u
lar
E
x
p
r
ess
io
n
Sear
ch
Alg
o
r
it
h
m
"
[
1
2
,
13]
to
d
escr
ib
e
a
r
eg
u
lar
ex
p
r
e
s
s
io
n
co
m
p
iler
.
He
w
as
b
ased
o
n
th
e
Klee
n
e
n
o
tatio
n
to
cr
ea
te
th
e
QE
D
ed
ito
r
to
h
elp
u
s
er
s
s
ea
r
ch
th
r
o
u
g
h
te
x
t
f
ile
s
.
T
h
e
w
o
r
k
o
f
Ken
T
h
o
m
p
s
o
n
h
a
s
m
ad
e
i
t
p
o
s
s
ib
le
to
d
o
g
lo
b
al
s
ea
r
ch
in
U
n
ix
f
ile
s
u
s
i
n
g
th
e
\
Glo
b
al
\
R
e
g
e
x
\
P
r
in
t
(
GR
E
P
)
co
m
m
a
n
d
s
,
w
h
ich
ar
e
c
u
r
r
en
tl
y
w
ell
k
n
o
w
n
.
Fro
m
th
e
8
0
s
,
r
eg
u
lar
ex
p
r
ess
io
n
s
b
eg
a
n
to
g
ai
n
g
r
e
at
p
o
p
u
lar
it
y
in
t
h
e
w
o
r
ld
o
f
co
m
p
u
ter
p
r
o
g
r
a
m
m
i
n
g
.
T
h
an
k
s
to
th
e
m
u
ltip
le
w
o
r
k
s
o
f
He
n
r
y
Sp
en
ce
r
,
P
er
l
lan
g
u
a
g
e
is
co
n
s
id
er
ed
a
m
o
n
g
th
e
f
ir
s
t
lan
g
u
ag
e
s
th
at
h
av
e
i
n
v
e
s
ted
a
lo
t
in
th
e
f
ield
o
f
r
eg
u
lar
ex
p
r
es
s
io
n
s
.
2
.
2
.
Reg
ula
r
ex
pres
s
io
n sy
m
bo
l
s
Sev
er
al
s
p
ec
ial
c
h
ar
ac
ter
s
ar
e
u
s
ed
to
b
u
ild
a
r
eg
e
x
,
P
au
l
B
o
er
s
m
a
a
n
d
Dav
id
W
ee
n
i
n
k
g
a
v
e
a
g
o
o
d
ex
p
lan
atio
n
to
th
e
s
e
s
y
m
b
o
l
s
w
it
h
s
i
m
p
le
e
x
a
m
p
les
to
f
ac
ili
tate
u
n
d
er
s
tan
d
i
n
g
[
1
4
]
.
I
n
th
e
f
o
llo
w
in
g
T
ab
le
1
w
e
s
u
m
m
ar
ize
th
e
m
ea
n
in
g
o
f
ea
ch
ch
ar
ac
ter
.
2
.
3
.
Reg
ula
r
ex
pres
s
io
n e
x
a
m
p
le
s
E
x
p
r
ess
io
n
s
ar
e
n
o
w
av
a
ilab
le
o
n
th
e
in
ter
n
et.
T
h
e
y
ar
e
ev
en
in
te
g
r
ated
w
ith
all
d
ev
elo
p
m
e
n
t
f
r
a
m
e
w
o
r
k
s
to
h
elp
d
ev
elo
p
er
s
v
alid
ate
d
ata
en
ter
ed
b
y
u
s
er
s
an
d
also
to
h
elp
th
e
m
e
x
tr
ac
t
d
ata
ac
co
r
d
in
g
to
th
e
co
n
tex
t
o
f
t
h
eir
w
o
r
k
.
W
e
g
i
v
e
b
elo
w
s
o
m
e
ex
a
m
p
les
with
th
e
n
ec
e
s
s
ar
y
e
x
p
lan
atio
n
s
in
o
r
d
er
to
in
itia
te
th
e
g
lo
b
al
s
tr
u
ct
u
r
e
o
f
a
r
e
g
u
l
ar
ex
p
r
ess
io
n
.
I
t
i
s
i
m
p
o
r
ta
n
t
t
o
n
o
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at
t
h
e
w
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r
ld
o
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r
eg
u
l
ar
ex
p
r
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it
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r
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x
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r
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n
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r
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e
s
i
m
p
lici
t
y
an
d
p
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n
d
esire
d
.
A
l
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(
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[
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An
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ex
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ca
lled
"
W
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C
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w
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in
a
f
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s
to
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in
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Had
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o
p
HDFS
[
1
5
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is
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er
y
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v
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k
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wh
en
i
t
co
m
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t
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p
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p
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s
s
in
g
d
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e
b
y
Ma
p
R
ed
u
ce
[
1
6
]
.
I
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th
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p
ap
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d
as
s
h
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in
T
ab
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8
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E
v
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th
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t
h
ese
t
w
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p
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m
s
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e
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co
m
p
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ed
to
th
e
task
t
h
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f
o
r
m
.
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itio
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th
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h
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y
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ep
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d
a
lo
t
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o
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in
k
s
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e,
th
e
d
ev
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p
er
m
u
s
t
b
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g
u
id
ed
b
y
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A
P
I
to
w
r
ite
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e
s
a
m
e
in
s
tr
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c
tio
n
s
f
o
r
th
e
s
a
m
e
p
r
o
b
le
m
.
So
m
e
l
i
m
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tatio
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s
o
f
t
h
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c
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en
t
A
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4.
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M
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NT
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ag
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ated
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AP
I
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to
h
an
d
le
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g
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lar
ex
p
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ess
i
o
n
s
a
n
d
to
s
i
m
p
li
f
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w
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k
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elo
p
er
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d
esp
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iall
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m
ak
e
t
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co
d
e
s
i
m
p
le
a
n
d
r
ea
d
ab
le
[
1
7
]
.
B
u
t
u
n
f
o
r
tu
n
a
tel
y
,
t
h
e
d
ev
e
l
o
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s
till
h
as
to
m
a
k
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f
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s
to
d
esig
n
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n
d
i
m
p
le
m
e
n
t
m
is
s
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g
a
lg
o
r
it
h
m
s
.
As
s
h
o
w
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i
n
th
e
t
w
o
p
r
ev
io
u
s
ex
a
m
p
le
s
,
to
ca
lcu
late
t
h
e
o
cc
u
r
r
en
ce
s
o
r
th
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a
v
er
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e
o
f
t
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s
f
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d
i
n
a
Strin
g
,
t
h
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d
ev
elo
p
er
m
u
s
t
d
esig
n
h
is
o
w
n
al
g
o
r
ith
m
a
n
d
m
u
s
t
i
m
p
le
m
e
n
t
it
in
s
e
v
er
al
lin
e
s
o
f
co
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e
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it
h
p
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s
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.
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itio
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o
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h
a
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ested
f
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n
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n
s
th
a
t
ar
e
im
p
le
m
e
n
ted
in
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r
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in
p
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g
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s
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e
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s
p
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p
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s
ed
in
Sectio
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e
in
s
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ir
ed
f
r
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m
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ate
C
r
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A
P
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[
1
8
]
an
d
m
en
tio
n
ed
i
n
T
ab
le
9
.
T
o
m
o
tiv
ate
th
e
u
s
ef
u
l
n
es
s
o
f
th
i
s
A
P
I
,
w
e
f
ir
s
t
p
r
o
p
o
s
e
to
s
tu
d
y
t
h
e
p
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ev
io
u
s
w
o
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k
s
a
n
d
th
en
d
escr
ib
e
th
e
s
tr
en
g
th
o
f
R
eg
e
x
C
r
iter
ia
A
P
I
in
p
r
o
ce
s
s
i
n
g
r
eg
e
x
’
s
r
es
u
lt
s
an
d
w
e
w
ill
f
o
c
u
s
later
o
n
h
o
w
t
h
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s
A
P
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n
a
v
o
id
th
e
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k
n
e
s
s
es e
n
co
u
n
ter
ed
b
y
d
ev
elo
p
er
s
w
h
e
n
u
s
i
n
g
t
h
e
r
eg
ex
i
n
p
r
o
g
r
a
m
s
.
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ab
le
9
.
Featu
r
es a
d
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ed
to
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ex
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u
r
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t
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a
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a
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o
w
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su
l
t
×
⎷
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g
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×
⎷
5.
RE
L
AT
E
D
WO
RK
S
T
h
e
r
eg
u
lar
ex
p
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g
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n
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h
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ce
m
en
ts
a
n
d
ex
ten
s
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s
f
r
o
m
1
9
4
3
u
n
t
il
to
d
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.
Sp
is
h
ak
E
[
1
0
]
r
e
m
ar
k
ed
t
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r
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r
s
d
u
e
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t
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s
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p
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o
t
b
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u
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m
e.
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,
h
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r
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lar
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x
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KT
[
1
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h
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2
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So
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