Regular Expressions 101

Group 1((?i)[A-Z]+)

(?i)applies the following effective flags to the remainder of the pattern: gmi

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Character Class[A-Z]+

+matches at least one character from the set below:

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

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

((?i)[A-Z]+)c

abcABC

说明：局部（ab）的大小写被忽略了，(?i)的作用范围在分组1内