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Option
Stands For
Description
g
Match Globally
Find all occurrences (not just the first instance). Primarily used
for pattern filtering operations.
i
Ignore Case
Causes match for any combination of [a-z] or [A-Z] equally.
m
Multi-line
Treat string as multiple lines.
o
Once
Only compile pattern once.
s
Single-line
Treat string as a single line.
x
Extended
Enable the use of "extended" regular
expressions.