regex101: PCRE2 (PHP) Match Workspace

Pro

^start of line

Character Class[a-z]

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

Character Class[a-z0-9_]{0,97}

{0,97}matches between 0 and 97 characters from the set below:

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[a-z0-9]

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

$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

25 tokens

Regular Expression

^[a-z][a-z0-9_]{0,97}[a-z0-9]$

New

1_no_starting_number
_no_starting_underscore
no_ending_underscore_
this_line_is_more_than_one_hundred_characters_long__this_line_is_more_than_one_hundred_characters_long
this_line_is_less_than_one_hundred_characters_long
this_is_a_valid_property_name_42
and_so_is_this_one

Extraction

1_no_starting_number
_no_starting_underscore
no_ending_underscore_
this_line_is_more_than_one_hundred_characters_long__this_line_is_more_than_one_hundred_characters_long
this_line_is_less_than_one_hundred_characters_long
this_is_a_valid_property_name_42
and_so_is_this_one