Regular Expressions 101

Explanation
Pro

1st Alternative(?=^[A-Z]+$)([\s\S]*?)(?=^[A-Z]+$)

Positive Lookahead(?=^[A-Z]+$)

^start of line

Character Class[A-Z]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

$end of line

Group 1([\s\S]*?)

Character Class[\s\S]*?

*?matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

Positive Lookahead(?=^[A-Z]+$)

^start of line

Character Class[A-Z]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

$end of line

2nd Alternative([\s\S]*)

Group 2([\s\S]*)

Character Class[\s\S]*

*matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?=^[A-Z]+$)([\s\S]*?)(?=^[A-Z]+$)|([\s\S]*)

New

ASDF
wqer rtre 34 $^&% fsfa
DDwrgd 43 er 1. ewrtfg
324rfegf 4gfgre

QWE
pritoy Fbhfg 45345 )*9
tret 345 gret54
retre 56 gre ger
retgrh 546ttre

PIIPUU
gre tt HKH rre345 
sdrfetre
ewrewrqwr werfewrt34vds

ret
gre
wretretertettre

MMNNBMB
aserew Sfjlkjf
gdf
rerettyrdfv re HFGHFFHF er
ergre ret retre 
ret retretret 

reg regrtgh rertgre tret