Regular Expressions 101

Group 1(^|\+|(?<=\s))

1st Alternative^

^start of line

2nd Alternative\+

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

3rd Alternative(?<=\s)

Positive Lookbehind(?<=\s)

\sany whitespace character

Group 2(100|\d\d?)

1st Alternative100

100the literal text 100

2nd Alternative\d\d?

\da digit

\d?optionally matches a digit

Positive Lookahead(?=(\s|$))

Group 3(\s|$)

1st Alternative\s

\sany whitespace character

2nd Alternative$

$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

(^|\+|(?<=\s))(100|\d\d?)(?=(\s|$))

New

0 Sam has 200 apples. He gives Todd 20 and Mary 125. and The weather is -5 C today, but will be +5 C tomorrow. 0  101 100