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

New

0
0.
0.0
0.00
0.0e0
0.0e-0
0.0e+0 
+0  
+0.    
+0.0
+0.00
+0.0e0
+0.0e-0
+0.0e+0
-0 
-0.
-0.0
-0.00
-0.0e0
-0.0e-0
-0.0e+0
1.
2.
3.
4.
-1.
-2.
-3.
-4.
.1
.2
.3
.4
-.1
-.2
-.3
-.4
1.0
3.0
4.0
5.0
-1.0
-2.0
-3.0
-4.0
-5.0
5.0123456
-5.012345678
-1
10
-10
10.0
-10.0
-10.01234
10.01234
0
1
01
001
   1   

Ne doit pas être validé

.
1..
.1.
..1
toto
1a
a1
a1a
1  a
a  1
a  1   a
-.1.
+.1.

Regular Expressions 101

Regular Expression

Extraction