Regular Expressions 101

1st Alternative((([0-9]*\.[0-9]+)|([0-9]+\.[0-9]*))(E(\+|-)?[0-9]+)?)

Group 1((([0-9]*\.[0-9]+)|([0-9]+\.[0-9]*))(E(\+|-)?[0-9]+)?)

Group 2(([0-9]*\.[0-9]+)|([0-9]+\.[0-9]*))

1st Alternative([0-9]*\.[0-9]+)

Group 3([0-9]*\.[0-9]+)

Character Class[0-9]*

*matches any number of characters from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

2nd Alternative([0-9]+\.[0-9]*)

Group 4([0-9]+\.[0-9]*)

Character Class[0-9]+

+matches at least one character from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]*

*matches any number of characters from the set below:

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

Group 5(E(\+|-)?[0-9]+)?

?repeats the group contents below at most once:

Ethe literal E (69₁₀ / 105₈ / 45₁₆) (case sensitive)

Group 6(\+|-)?

?repeats the group contents below at most once:

1st Alternative\+

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

2nd Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

2nd Alternative([0-9]+(E(\+|-)?[0-9]+))

Group 7([0-9]+(E(\+|-)?[0-9]+))

Character Class[0-9]+

+matches at least one character from the set below:

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

Group 8(E(\+|-)?[0-9]+)

Ethe literal E (69₁₀ / 105₈ / 45₁₆) (case sensitive)

Group 9(\+|-)?

?repeats the group contents below at most once:

1st Alternative\+

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

2nd Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

Global pattern flags

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

((([0-9]*\.[0-9]+)|([0-9]+\.[0-9]*))(E(\+|-)?[0-9]+)?)|([0-9]+(E(\+|-)?[0-9]+))

New

1.123
1.E123

Regular Expression

Substitution