Regular Expressions 101

(?s)applies the following effective flags to the remainder of the pattern: gms

s modifier: single line. Allows a dot to match line terminators

^start of line

.*any character, repeated any number of times

\sany whitespace character

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

^start of line

Group 1(48\s50\s20\s43\s45\s32\s35\s35\s41\s00|48\s50\s20\s43\s45\s32\s35\s35\s58\s00)

1st Alternative48\s50\s20\s43\s45\s32\s35\s35\s41\s00

48the literal text 48

\sany whitespace character

50the literal text 50

\sany whitespace character

20the literal text 20

\sany whitespace character

43the literal text 43

\sany whitespace character

45the literal text 45

\sany whitespace character

32the literal text 32

\sany whitespace character

35the literal text 35

\sany whitespace character

35the literal text 35

\sany whitespace character

41the literal text 41

\sany whitespace character

00the literal text 00

2nd Alternative48\s50\s20\s43\s45\s32\s35\s35\s58\s00

48the literal text 48

\sany whitespace character

50the literal text 50

\sany whitespace character

20the literal text 20

\sany whitespace character

43the literal text 43

\sany whitespace character

45the literal text 45

\sany whitespace character

32the literal text 32

\sany whitespace character

35the literal text 35

\sany whitespace character

35the literal text 35

\sany whitespace character

58the literal text 58

\sany whitespace character

00the literal text 00

$end of line

Positive Lookahead(?=.*:\1=(\w+))

.*any character, repeated any number of times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\1the text saved by group 1

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group 2(\w+)

\w+any word character, repeated at least once

$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

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Regular Expression

(?s)^.*\s\n^(48\s50\s20\s43\s45\s32\s35\s35\s41\s00|48\s50\s20\s43\s45\s32\s35\s35\s58\s00)$(?=.*:\1=(\w+))$

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