regex101: Python Substitution Workspace

Pro

1st Alternative(subject name=\"(?:Biology|chem102)\"[\s\S]+?)\r?\n^topic$

Group 1(subject name=\"(?:Biology|chem102)\"[\s\S]+?)

subject name=the literal text subject name= (case sensitive)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

Non-Capturing Group(?:Biology|chem102)

1st AlternativeBiology

Biologythe literal text Biology (case sensitive)

2nd Alternativechem102

chem102the literal text chem102 (case sensitive)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

Character Class[\s\S]+?

+?matches at least one character from the set below:

\sa Unicode whitespace character

\Sany character that is not Unicode whitespace

\r?optionally matches a carriage return (ASCII 13)

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

^start of line

topicthe literal text topic (case sensitive)

$end of line

2nd Alternative(^topic$\r?\n)

Group 2(^topic$\r?\n)

^start of line

topicthe literal text topic (case sensitive)

$end of line

\r?optionally matches a carriage return (ASCII 13)

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

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

25 tokens

Regular Expression

(subject name=\"(?:Biology|chem102)\"[\s\S]+?)\r?\n^topic$|(^topic$\r?\n)

subject name="Biology" value="12th"
topic name="system" value="anything"
topic
subject name="mathematics" value="12th"
topic name="system" value="anything"
other topics ="anything" value="anything"
topic
subject name="chem102" value="12th"
topic name="system" value="anything"
topic
subject name="ComputerSc" value="12th"
topic name="system" value="anything"
other topics ="anything" value="anything"
topic

Substitution

\1\2\n

subject name="Biology" value="12th"
topic name="system" value="anything"
topic
subject name="mathematics" value="12th"
topic name="system" value="anything"
other topics ="anything" value="anything"
topic
subject name="chem102" value="12th"
topic name="system" value="anything"
topic
subject name="ComputerSc" value="12th"
topic name="system" value="anything"
other topics ="anything" value="anything"
topic