Regular Expressions 101

1st Alternative(?:_missing_:|_exists_:)([a-z1-9]+)

Non-Capturing Group(?:_missing_:|_exists_:)

1st Alternative_missing_:

_missing_:the literal text _missing_: (case sensitive)

2nd Alternative_exists_:

_exists_:the literal text _exists_: (case sensitive)

Group 1([a-z1-9]+)

Character Class[a-z1-9]+

+matches at least one character from the set below:

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

1-9one character from 1 (49₁₀) to 9 (57₁₀)

2nd Alternative([a-z1-9]+)(?=:)

Group 2([a-z1-9]+)

Character Class[a-z1-9]+

+matches at least one character from the set below:

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

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Positive Lookahead(?=:)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

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.

26 tokens

Regular Expression

(?:_missing_:|_exists_:)([a-z1-9]+)|([a-z1-9]+)(?=:)

New

_missing_:title age:(>=10 AND < 20) AND age:123 AND _exists_:title123