Regular Expressions 101

1st Alternative^[a-z]*

^start of line

Character Class[a-z]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

2nd Alternative(?<=q\[)\d*(?=\])

Positive Lookbehind(?<=q\[)

qthe literal q (113₁₀ / 161₈ / 71₁₆) (case sensitive)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\d*a digit, repeated any number of times

Positive Lookahead(?=\])

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

^[a-z]*|(?<=q\[)\d*(?=\])

Test String
New


h q[0];
h q[1];
h q[2];
h q[3];
cx q[1],q[2];
t q[1];
t q[2];
cx q[0],q[1];
cx q[2],q[3];
t q[0];
y q[1];
x q[2];
t q[3];
cx q[2],q[1];
t q[2];
x q[1];
cx q[0],q[1];
measure q[0] -> c[0];
measure q[3] -> c[3];
measure q[2] -> c[2];
measure q[1] -> c[1];

Regular Expression

Test StringNew

ExtractionProcessing...

Test String
New

Extraction
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