Regular Expressions 101

Pro

Negative Lookbehind(?<![\d-])

Character Class[\d-]

\da Unicode decimal digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookbehind(?<!- )

- the literal text -

\d{7}a Unicode decimal digit, repeated exactly 7 times

Negative Lookahead(?!\d)

\da Unicode decimal digit

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

(?<![\d-])(?<!- )\d{7}(?!\d)

New

RE:'HC=312-822-281' abc2-1234567 7354612
RE:'HC=312-822-281' abc2- 1234567 7354612

RE:'HC=312-822-281' abc2-1234567 7354612
RE:'HC=312-822-281' abc2- 1234567 7354612