regex101: PCRE (Legacy) Match Workspace

Group 1(^[\s]*[-+]?[0-9]*?\.?[0-9]+([eE][-+]?[0-9]+)?[\s]*$|^[\s]*[-+]?[0-9]+\.?[\s]*$)

1st Alternative^[\s]*[-+]?[0-9]*?\.?[0-9]+([eE][-+]?[0-9]+)?[\s]*$

^start of line

Character Class[\s]*

*matches any number of characters from the set below:

\sany whitespace character

Character Class[-+]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

Character Class[0-9]*?

*?matches any number of characters from the set below:

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

\.?optionally matches 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)

Group 2([eE][-+]?[0-9]+)?

?repeats the group contents below at most once:

Character Class[eE]

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

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

Character Class[-+]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

Character Class[\s]*

*matches any number of characters from the set below:

\sany whitespace character

$end of line

2nd Alternative^[\s]*[-+]?[0-9]+\.?[\s]*$

^start of line

Character Class[\s]*

*matches any number of characters from the set below:

\sany whitespace character

Character Class[-+]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\s]*

*matches any number of characters from the set below:

\sany whitespace character

$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

Search reference

Regular Expression

(^[\s]*[-+]?[0-9]*?\.?[0-9]+([eE][-+]?[0-9]+)?[\s]*$|^[\s]*[-+]?[0-9]+\.?[\s]*$)

Unit Tests

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