Regular Expressions 101

Non-Capturing Group(?:[\(\)eA-Z][a-z]*(?:_\{? ?\d*\}?(?:(?:_\d)?)*)?)+

+repeats the group contents below at least once:

Character Class[\(\)eA-Z]

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Character Class[a-z]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Non-Capturing Group(?:_\{? ?\d*\}?(?:(?:_\d)?)*)?

?repeats the group contents below at most once:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\{?optionally matches the literal { (123₁₀ / 173₈ / 7B₁₆)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

\d*a Unicode decimal digit, repeated any number of times

\}?optionally matches the literal } (125₁₀ / 175₈ / 7D₁₆)

Non-Capturing Group(?:(?:_\d)?)*

*repeats the group contents below any number of times:

Non-Capturing Group(?:_\d)?

?repeats the group contents below at most once:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\da Unicode decimal digit

Non-Capturing Group(?:\^\{? ?\d*[\+-]?\}?)?

?repeats the group contents below at most once:

\^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

\{?optionally matches the literal { (123₁₀ / 173₈ / 7B₁₆)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

\d*a Unicode decimal digit, repeated any number of times

Character Class[\+-]?

?matches at most one character from the set below:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\}?optionally matches the literal } (125₁₀ / 175₈ / 7D₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?:[\(\)eA-Z][a-z]*(?:_\{? ?\d*\}?(?:(?:_\d)?)*)?)+(?:\^\{? ?\d*[\+-]?\}?)?

New

(NO_3)_{2} + (SO_4)_{21}