Regular Expressions 101

Explanation

Pro

^start of line

Group 1([gl][te]|eq|ne|i?like)

1st Alternative[gl][te]

Character Class[gl]

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case sensitive)

lthe literal l (108₁₀ / 154₈ / 6C₁₆) (case sensitive)

Character Class[te]

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case sensitive)

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

2nd Alternativeeq

eqthe literal text eq (case sensitive)

3rd Alternativene

nethe literal text ne (case sensitive)

4th Alternativei?like

i?optionally matches the literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

likethe literal text like (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:\h+(?:and|or)\h+(?1)\.\d+)*

*repeats the group contents below any number of times:

\h+any horizontal whitespace character, repeated at least once

Non-Capturing Group(?:and|or)

1st Alternativeand

andthe literal text and (case sensitive)

2nd Alternativeor

orthe literal text or (case sensitive)

\h+any horizontal whitespace character, repeated at least once

(?1)calls group 1 as a subroutine

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

$end of line

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

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25 tokens

^([gl][te]|eq|ne|i?like)\.\d+(?:\h+(?:and|or)\h+(?1)\.\d+)*$

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