regex101: string-format-1

1st Alternative({})\1

Group 1({})

{}the literal text {}

\1the text saved by group 1

2nd Alternative[{](|\s*?[^\s{}]+?\s*?|\s*?\S+?\(.*?\)\s*?|\s*?['][^']+?[']\s*?|\s*?["][^"]+?["]\s*?|\s*?["][^"]+?["]\.\S+?\(.*?\)\s*?|\s*?['][^']+?[']\.\S+?\(.*?\)\s*?)(?:!(\S+?))?[}]

Character Class[{]

{the literal { (123₁₀ / 173₈ / 7B₁₆)

Group 2(|\s*?[^\s{}]+?\s*?|\s*?\S+?\(.*?\)\s*?|\s*?['][^']+?[']\s*?|\s*?["][^"]+?["]\s*?|\s*?["][^"]+?["]\.\S+?\(.*?\)\s*?|\s*?['][^']+?[']\.\S+?\(.*?\)\s*?)

1st Alternative — matches an empty string

2nd Alternative\s*?[^\s{}]+?\s*?

\s*?any whitespace character, repeated any number of times

Negated Character Class[^\s{}]+?

+?matches at least one character outside the set below:

\sany whitespace character

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

\s*?any whitespace character, repeated any number of times

3rd Alternative\s*?\S+?\(.*?\)\s*?

\s*?any whitespace character, repeated any number of times

\S+?any non-whitespace character, repeated at least once

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

.*?any character (except for line terminators), repeated any number of times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\s*?any whitespace character, repeated any number of times

4th Alternative\s*?['][^']+?[']\s*?

\s*?any whitespace character, repeated any number of times

Character Class[']

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Negated Character Class[^']+?

+?matches at least one character outside the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Character Class[']

'the literal ' (39₁₀ / 47₈ / 27₁₆)

\s*?any whitespace character, repeated any number of times

5th Alternative\s*?["][^"]+?["]\s*?

\s*?any whitespace character, repeated any number of times

Character Class["]

"the literal " (34₁₀ / 42₈ / 22₁₆)

Negated Character Class[^"]+?

+?matches at least one character outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

Character Class["]

"the literal " (34₁₀ / 42₈ / 22₁₆)

\s*?any whitespace character, repeated any number of times

6th Alternative\s*?["][^"]+?["]\.\S+?\(.*?\)\s*?

\s*?any whitespace character, repeated any number of times

Character Class["]

"the literal " (34₁₀ / 42₈ / 22₁₆)

Negated Character Class[^"]+?

+?matches at least one character outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

Character Class["]

"the literal " (34₁₀ / 42₈ / 22₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\S+?any non-whitespace character, repeated at least once

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

.*?any character (except for line terminators), repeated any number of times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\s*?any whitespace character, repeated any number of times

7th Alternative\s*?['][^']+?[']\.\S+?\(.*?\)\s*?

\s*?any whitespace character, repeated any number of times

Character Class[']

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Negated Character Class[^']+?

+?matches at least one character outside the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Character Class[']

'the literal ' (39₁₀ / 47₈ / 27₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\S+?any non-whitespace character, repeated at least once

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

.*?any character (except for line terminators), repeated any number of times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\s*?any whitespace character, repeated any number of times

Non-Capturing Group(?:!(\S+?))?

?repeats the group contents below at most once:

!the literal ! (33₁₀ / 41₈ / 21₁₆)

Group 3(\S+?)

Character Class[}]

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

26 tokens

Regular Expression

({})\1|[{](|\s*?[^\s{}]+?\s*?|\s*?\S+?\(.*?\)\s*?|\s*?['][^']+?[']\s*?|\s*?["][^"]+?["]\s*?|\s*?["][^"]+?["]\.\S+?\(.*?\)\s*?|\s*?['][^']+?[']\.\S+?\(.*?\)\s*?)(?:!(\S+?))?[}]

New

{k} must-match
{} jhtgj {} must-match
{ } not-match 

'"{firstName} {lastName}" <{email}>'

{0.concat("8a b c d e", 6)} must-match
s df s sd{"one fielslkein 897sd'f8'97f 89s(*Y*&Sc {}d name".toFixed(7 , 8)} must-match
s df s sd{'one fielslkein "897sd"f897f 89s(*Y*&Sc {}d name'.toFixed(7 , 8)} must-match
sd{0.concat("8a b c d e", 6)} must-match

ascdac{ "one fieldname" } must-match
ascdac{ "onefi eldname".kk(kk, "dd") } must-match
{onefieldname.toFixed(7 , 8)} must-match
dfgsdg { "onefieldname".toFixed(7 , 8)} must-match
{onefieldname: "toFixed(7 , 8)"} not-match
{"onefieldname": "toFixed(7 , 8)"} not-match
{ "onefiel dname" : "toFixed(7 , 8)"} not-match
{ "onefiel dname": 8} not-match 

{ "o dna" : {onefi eldname.l(7 , 8)} } not-match
{ "o dna" : {"onefi eldname".l(7 , 8)} } match-inner
{ "f dna" : {"onefi eldname".toFixed(7 , 8) }} match-inner
{ "f dna" : { "onefi eldname".toFixed(7 , 8) }} match-inner
{ "o dme" : {onefieldname.toFixed(7 , 8)} } match-inner
{ "on dname" : {  onefieldname.toFixed(7 , 8)} } match-inner

{ {}: "{}" }

Regular Expressions 101

Regular Expression

Extraction