Regular Expressions 101

^start of line

Negated Character Class[^\d\r\n]*

*matches any number of characters outside the set below:

\da digit

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

\ban ASCII word boundary

Group 1(\d+)

\d+a digit, repeated at least once

Group 2([admno]\d+)?

?repeats the group contents below at most once:

Character Class[admno]

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

nthe literal n (110₁₀ / 156₈ / 6E₁₆) (case sensitive)

othe literal o (111₁₀ / 157₈ / 6F₁₆) (case sensitive)

\d+a digit, repeated at least once

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

^[^\d\r\n]*\b(\d+)([admno]\d+)?

Test String
New

"Some string without integer 12345a1% rest of the string with/without integer"

// First
"Some string 12345a1% some other string."

// Second
"Somet string 23456b2! some other string

Regular Expression

Test StringNew

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Test String
New

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