Regular Expressions 101

LD_PRELOAD=the literal text LD_PRELOAD= (case sensitive)

Group 1(\S+)

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

Character Class[\n\r]+

+matches at least one character from the set below:

\na line-feed (newline) character (ASCII 10)

\ra carriage return (ASCII 13)

^start of line

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

exportthe literal text export (case sensitive)

\s+any whitespace character, repeated at least once

LD_PRELOADthe literal text LD_PRELOAD (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

LD_PRELOAD=(\S+)[\n\r]+^\s*export\s+LD_PRELOAD

New

# Some comment
LD_PRELOAD=/usr/lib64/libstdc++.so.6

export LD_PRELOAD

# more comments