Regular Expressions 101

Character Class[a-z\d]+

+matches at least one character from the set below:

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

\da Unicode decimal digit

Non-Capturing Group(?:[-_’',.][a-z\d]+)*

*repeats the group contents below any number of times:

Character Class[-_’',.]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

’the literal ’ (8217₁₀ / 20031₈ / 2019₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z\d]+

+matches at least one character from the set below:

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

\da Unicode decimal digit

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

u modifier: unicode. Treats the pattern and subject as UTF-16

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

[a-z\d]+(?:[-_’',.][a-z\d]+)*

New

_ - – hel’lo’ hel'lo' .1 1.0 1. hello, hello- world. he,llo hello-world hello_world hel-lo-world hello9world -20 20- 20-year -20year- -20-year- 20-year-old 20-yearold 20year-old 20-year-old-old 20-20-year-20-old-

Regular Expression

Substitution