Regular Expressions 101

Group 1([1-9][0-9]*)

Character Class[1-9]

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

Character Class[0-9]*

*matches any number of characters from the set below:

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

([1-9][0-9]*)$

000055448540
000000015000
0010000000
50
08
05


# does not work, it returns leading zeros as match.
# (?:^0+)|(\d+)$