Regex pattern in javascipt /[0-9]{7}$/

Question

how to check the string if the last 7 chars contains numbers or not using regex in java.

[0-9] <- Match any of the digits 0-9 {7} <- Has to be 7 digits in a row $ <- These 7 digits have to be right before a newline — jh316, Dec 25 '21 at 06:55
can you give any example string which matches that pattern.. I didn't understood what right before newline means.. — Vamsi, Dec 25 '21 at 07:12
sfasdofjao1234567 matches 1234567. aspfkaspf0923523 matches 0923523. 1234567abcde0987654 only matches 0987654, because it ends right before a newline (end of line), while 1234567 doesn't. — jh316, Dec 25 '21 at 07:21

score 0 · Answer 1 · answered Dec 25 '21 at 07:05

[0-9] = will match any digit,
{7} = the length of the digits, so the matched string will be exactly 7 digits long
$ = signifies end of line

so this regex will match any line that ends with 7 digits

a good way to start learning is sites like https://regex101.com/, which explain the whole regex string you input

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