Regular Expressions 101

Pro

Atomic Group(?># *(*SKIP)(*FAIL)|(?:^|\s))

1st Alternative# *(*SKIP)(*FAIL)

#the literal # (35₁₀ / 43₈ / 23₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*FAIL)forces the current match attempt to fail at this position

2nd Alternative(?:^|\s)

Non-Capturing Group(?:^|\s)

1st Alternative^

^start of line

2nd Alternative\s

\sany whitespace character

testthe literal text test (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

thisthe literal text this (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

regexthe literal text regex (case sensitive)

\s+any whitespace character, repeated at least once

\"the literal " (34₁₀ / 42₈ / 22₁₆)

Negated Character Class[^"]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

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.

25 tokens

(?># *(*SKIP)(*FAIL)|(?:^|\s))test\.this\.regex\s+\"[^"]*\"

New

    test.this.regex "sup1" hi |sup1| #  test.this.regex "sup3" hi |sup3|
#     test.this.regex "sup2" do |sup2|
    test.this.regex "sup2" do |sup2|

    test.this.regex "sup1" hi |sup1| #  test.this.regex "sup3" hi |sup3|
#     test.this.regex "sup2" do |sup2|
    test.this.regex "sup2" do |sup2|