Regular Expressions 101

Pro

^start of line

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

.*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

Regular Expression

^[12].*

1 This is a test
2 This is a test
3 This is a test
4 This is a test
1 This is another test
2 This is another test
3 This is another test
4 This is another test

Substitution

1 This is a test
2 This is a test
3 This is a test
4 This is a test
1 This is another test
2 This is another test
3 This is another test
4 This is another test