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CHR_ISALM  -  Return whether a character is alphanumeric

Description:
Determine whether a character is alphanumeric, i.e. A - Z, a - z, 0 - 9 or _. Note that this routine treats the underscore character as an alphanumeric character.

Invocation:
RESULT = CHR_ISALM( CVALUE )

Arguments:
CVALUE = CHARACTER (Given)
The character to be tested.

Returned Value:
CHR_ISALM = LOGICAL
Returns .TRUE. if the given character is alphanumeric, returns .FALSE. otherwise.



next up previous
Next: CHR_ISDIG - Return whether a character is a digit
Up: Routine Descriptions
Previous: CHR_ISALF - Return whether a character is alphabetic



CHR Character Handling Routines
Starlink User Note 40
A C Charles
P C T Rees
A J Chipperfield
2 August 1995
E-mail:ussc@star.rl.ac.uk