regex101: JavaScript Match Workspace

Pro

^start of line

Non-Capturing Group(?:(?:\w+)(?:\[(?:\d*|'[^']*')\])*=[\w\-\+\.%]*(?:&|$))+

+repeats the group contents below at least once:

Non-Capturing Group(?:\w+)

\w+any word character, repeated at least once

Non-Capturing Group(?:\[(?:\d*|'[^']*')\])*

*repeats the group contents below any number of times:

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Non-Capturing Group(?:\d*|'[^']*')

1st Alternative\d*

\d*a digit, repeated any number of times

2nd Alternative'[^']*'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Negated Character Class[^']*

*matches any number of characters outside the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Character Class[\w\-\+\.%]*

*matches any number of characters from the set below:

\wany word character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

Non-Capturing Group(?:&|$)

1st Alternative&

&the literal & (38₁₀ / 46₈ / 26₁₆)

2nd Alternative$

$end of line

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

26 tokens

Regular Expression

^(?:(?:\w+)(?:\[(?:\d*|'[^']*')\])*=[\w\-\+\.%]*(?:&|$))+$

New

hello=value&am=i
hellp
help=me
pleas=help&me=plz&var[]=true
pleas=&me=&var[]=
helo&ewepcmwep&lalal=true
pleas=help&me=plz&var[]=true&var[2]=false&var['blahblah']=ipsum
pleas=help&me=plz&var[][][]['λαλαλα']=true&var[2]=false&var['blahblah']=ipsum
pleas=ContentDisposition%3A%20formdata%3B%20name%3D%22myfile%22%3B%20filename%3D%22exclude.txt%22&me=plz&var[]=true&var[2]=false&var['blahblah']=ipsum

Extraction

hello=value&am=i
hellp
help=me
pleas=help&me=plz&var[]=true
pleas=&me=&var[]=
helo&ewepcmwep&lalal=true
pleas=help&me=plz&var[]=true&var[2]=false&var['blahblah']=ipsum
pleas=help&me=plz&var[][][]['λαλαλα']=true&var[2]=false&var['blahblah']=ipsum
pleas=ContentDisposition%3A%20formdata%3B%20name%3D%22myfile%22%3B%20filename%3D%22exclude.txt%22&me=plz&var[]=true&var[2]=false&var['blahblah']=ipsum