Regular Expressions 101

Explanation

Pro

^start of line

.*any character (except for line terminators), repeated any number of times

the literal (32₁₀ / 40₈ / 20₁₆)

Group 1((?:([12])|(3)|([45]))\d{4})

Non-Capturing Group(?:([12])|(3)|([45]))

1st Alternative([12])

Group 2([12])

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

2nd Alternative(3)

Group 3(3)

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

3rd Alternative([45])

Group 4([45])

Character Class[45]

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

\d{4}a digit, repeated exactly 4 times

the literal (32₁₀ / 40₈ / 20₁₆)

.*any character (except for line terminators), repeated any number of times

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

^.* ((?:([12])|(3)|([45]))\d{4}) .*

New

Blah 12345 Blah
Blah 22345 Blah
Blah 32345 Blah
Blah 42345 Blah
Blah 52345 Blah

(?2AAA:(?3BBB:XYZ))$1

Blah 12345 Blah
Blah 22345 Blah
Blah 32345 Blah
Blah 42345 Blah
Blah 52345 Blah